Handle both modules build variants: modern and old

[Peter-Sh]

Allows to merge .github/ contents from unstable to other branches without conflicts

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Note

Medium Risk
CI module checkout refs depend on the new fallback logic; release automation now relies on a git-sourced dependency for version parsing used in stackbrew/CI flows.

Overview
CI image labels now resolve Redis module refs for both modern trees (scripts/lib/manifest.sh) and legacy trees (MODULE_VERSION in modules/<name>/Makefile), with clearer errors when neither exists. Module version env vars are set via shell variables before appending to GITHUB_ENV.

Release automation drops the in-repo RedisVersion model and duplicated redis-version Typer commands in favor of the redis-version package from redis-oss-release-automation (git dependency). The CLI still exposes redis-version by mounting the external app. Minimum Python is raised to 3.9; uv.lock and tests are updated (local RedisVersion tests removed; integration covers redis-version major).

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