Chia-Network / chia-blockchain / 25352020977

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ci: shallow checkout in test-single to fix Windows runner tag-lock failures (#20848)

Every Windows test job has been failing on `Checkout code` since at least
2025-05-02 because a stale `.git/refs/tags/alpha-1.0.lock` file is present
when `actions/checkout` with `fetch-depth: 0` tries to refresh tag refs.

Tests don't need git history or tags. Switch to a shallow clone with tag
fetching disabled so checkout no longer touches tag refs.

10603 of 11810 branches covered (89.78%)

Branch coverage included in aggregate %.

108649 of 118860 relevant lines covered (91.41%)

1.83 hits per line