Drop unused sonic-yang-mgmt dependency

[berendt]

What

Removes the sonic-yang-mgmt git dependency from Pipfile and Pipfile.lock.

Why

sonic-yang-mgmt was added in #2191 for the original libyang-based SONiC config validator. #2253 replaced that validator with offline-generated Pydantic schemas and cleaned up requirements.txt, requirements.sonic.txt and the Containerfile — but left the dependency behind in Pipfile/Pipfile.lock.

Nothing imports sonic_yang_mgmt anymore:

• the runtime validator depends only on pydantic (see osism/tasks/conductor/sonic/validator.py)
• the schema generator (tools/sonic_yang_to_pydantic.py) uses pyang, which stays

It was also the only git dependency in the lockfile.

Notes

• The Pipfile.lock _meta hash was recomputed with pipenv's own calculate_pipfile_hash() so the lockfile stays in sync with the Pipfile.
• pyang is intentionally kept — it is required by the schema generator.

🤖 Generated with Claude Code

[sourcery-ai]

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