ci: T8947: point CLA check at vyos-cla-signatures@production (rollout 1c follow-up) (#60)

Rollout 1c (IS-503) renamed vyos-cla-signatures' default branch to `production`,
but cla-check.yml still called the reusable at @current. The `current` branch of
vyos-cla-signatures has diverged from `production` and its copy of cla-reusable.yml
writes signatures to `branch: 'current'` — so CLA signatures from this repo's PRs
were landing on the stale `current` branch instead of `production`.

Flip the ref to @production (whose cla-reusable.yml writes to `branch: 'production'`).

Note: migrating/reconciling signatures already accumulated on
vyos-cla-signatures@current (and whether to delete that branch) is a separate
operator decision tracked in IS-504 / T8947.

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