Bump pygments from 2.20.0 to 2.21.0 in /docs/sphinx

[dependabot]

Bumps pygments from 2.20.0 to 2.21.0.

Release notes

Sourced from pygments's releases.

2.21.0

• New lexers:

  • BitBake (#3103)
  • Caddyfile (#3225)
  • CEL (#3048)
  • PureScript (#1077, #3054)

• Updated lexers:

  • Bash: Fix coloured keyword at the beginning of a name (#2926)
  • Boogie: Add missing Boogie and Civl Verifier keywords (#3156)
  • C#:
    • Recognize interpolated verbatim strings with either $@ or @$ prefixes (#2685)
    • Support dollar-prefixed and multi-quote raw strings (#3129, #2897)
    • Recognize union (#3182)
  • C/C++:
    • Add C23/C++26 attributes (#3084)
    • Add more C2Y keywords (#3092)
    • Highlight a function following a namespace body (#2928)
    • Fix C/C++ lexer support for multiline pre-processor comments (#3051)
    • Add .ipp as a file extension (#3141, #1008)
  • Clojure: Recognize named, octal and unicode character literals such as \space and \o377 as a single token (#979)
  • Csound: Add missing opcode parameter type letter (#3161)
  • CUDA: Derive from the C++ lexer instead of C to highlight C++ constructs such as template, class and namespace (#3127)
  • D: Allow non-ASCII (Unicode) identifiers (#1088)
  • Fish: Fix single quote backslash escape (#3138, #2821)
  • Go: Various lexer improvements (#3199)
  • GoogleSQL: Require a word break after SET (#3167)
  • Hexdump: Only match valid digits (#3200, #2847)
  • JavaScript: Highlight the arguments object (#3146)
  • Jsonnet: Recognize colons in array slice expressions (#2828)
  • JSX: Allow apostrophes in element text (#2816)
  • Julia: Fix rstrings backslash (#3140, #2537)
  • Kotlin: Support companion objects without an explicit name (#2525)
  • Kotlin: Don't let a nullable type marker (?) consume the following character, so Foo?, and a?:b tokenize correctly (#2964)
  • Kusto: Recognize member-access dots in dynamic objects (#2779)
  • Lua: Various improvements (#3143)
  • Macaulay2: Update symbols to 1.26.05 (#3120)
  • Markdown:
    • Highlight bold-italics (***...*** and ___...___) (#3067)
    • Fix mention regex to support hyphens in usernames (#3139, #3135)
  • Markdown, reStructuredText, TiddlyWiki5: Fix wrong token offsets for embedded code blocks (#3133)
  • Mathematica: Recognize \[Name] named-character escapes such as \[Nu] instead of emitting an Error token (#3097)

... (truncated)

Changelog

Sourced from pygments's changelog.

Version 2.21.0

(released August 17th, 2026)

• New lexers:

  • BitBake (#3103)
  • Caddyfile (#3225)
  • CEL (#3048)
  • PureScript (#1077, #3054)

• Updated lexers:

  • Bash: Fix coloured keyword at the beginning of a name (#2926)
  • Boogie: Add missing Boogie and Civl Verifier keywords (#3156)
  • C#:
    • Recognize interpolated verbatim strings with either $@ or @$ prefixes (#2685)
    • Support dollar-prefixed and multi-quote raw strings (#3129, #2897)
    • Recognize union (#3182)
  • C/C++:
    • Add C23/C++26 attributes (#3084)
    • Add more C2Y keywords (#3092)
    • Highlight a function following a namespace body (#2928)
    • Fix C/C++ lexer support for multiline pre-processor comments (#3051)
    • Add .ipp as a file extension (#3141, #1008)
  • Clojure: Recognize named, octal and unicode character literals such as \space and \o377 as a single token (#979)
  • Csound: Add missing opcode parameter type letter (#3161)
  • CUDA: Derive from the C++ lexer instead of C to highlight C++ constructs such as template, class and namespace (#3127)
  • D: Allow non-ASCII (Unicode) identifiers (#1088)
  • Fish: Fix single quote backslash escape (#3138, #2821)
  • Go: Various lexer improvements (#3199)
  • GoogleSQL: Require a word break after SET (#3167)
  • Hexdump: Only match valid digits (#3200, #2847)
  • JavaScript: Highlight the arguments object (#3146)
  • Jsonnet: Recognize colons in array slice expressions (#2828)
  • JSX: Allow apostrophes in element text (#2816)
  • Julia: Fix rstrings backslash (#3140, #2537)
  • Kotlin: Support companion objects without an explicit name (#2525)
  • Kotlin: Don't let a nullable type marker (?) consume the following character, so Foo?, and a?:b tokenize correctly (#2964)
  • Kusto: Recognize member-access dots in dynamic objects (#2779)
  • Lua: Various improvements (#3143)
  • Macaulay2: Update symbols to 1.26.05 (#3120)
  • Markdown:
    • Highlight bold-italics (***...*** and ___...___) (#3067)
    • Fix mention regex to support hyphens in usernames (#3139, #3135)
  • Markdown, reStructuredText, TiddlyWiki5: Fix wrong token offsets for

... (truncated)

Commits

• a43b45d Get ready for the 2.21.0 release.
• d8f14cb Fix version_added for Purescript.
• 19c5817 Remove superfluous parentheses from PostgresExplainLexer (#3232)
• 9992e09 Merge pull request #3191 from jvoisin/dupes
• bd22577 Fix regexlint warnings after latest update.
• 6a62df1 Release preparation: Update the changelog.
• aabba32 Merge pull request #3221 from jvoisin/alter
• d3441d0 Merge pull request #3225 from jvoisin/caddy
• c593f3f Add a lexer for Caddy
• 0644b53 Simplify single-character regex alternations to character classes
• Additional commits viewable in compare view

[alecgrieser]

We should wait for #4510 to validate this doesn't break the docs build

[alecgrieser]

@dependabot rebase