mavlink: 2026.8.8-1 in 'humble/distribution.yaml' [bloom]

[vooon]

Increasing version of package(s) in repository mavlink to 2026.8.8-1:

• upstream repository: https://github.com/mavlink/mavlink.git
• release repository: https://github.com/ros2-gbp/mavlink-gbp-release.git
• distro file: humble/distribution.yaml
• bloom version: 0.14.3
• previous version for package: 2026.6.6-1

[github-actions]

For changes related to rosdistro:

• ✅ New packages are named appropriately
• ✅ An up-to-date Bloom version was used
• ✅ Release changes are confined to a single distribution

For changes related to yamllint:

• ✅ All new lines of YAML pass linter checks

[mergify]

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