replace core v2 JSON-LD context URL from protocol-specifications-new to protocol-specifications-v2

[em-digvijay]

We need to update schema references to the Beckn Core v2 JSON-LD context to point to the correct repository.

Replace

https://raw.githubusercontent.com/beckn/protocol-specifications-new/refs/heads/main/schema/core/v2/context.jsonld

With

https://raw.githubusercontent.com/beckn/protocol-specifications-v2/refs/heads/main/schema/core/v2/context.jsonld

Scope

All files under schema/** including examples (examples/**) and any schema YAML/JSON/JSON-LD.

Currently affected (found via search):

schema/core/v2/attributes.yaml (12 occurrences)

Acceptance criteria

No occurrences of protocol-specifications-new/refs/heads/main/schema/core/v2/context.jsonld remain under schema/**.
Any @context enum/example values use the new URL (no trailing spaces).
(Optional sanity check) rg 'protocol-specifications-new/refs/heads/main/schema/core/v2/context\.jsonld' schema returns zero matches.

[rajaneeshk90]

Have made an initial change: beckn/protocol-specifications-v2#112

Will go through it once more to check for any other descrepencies.