fix(ci): checkout tag ref in goreleaser to match tag commit

After rebase-and-merge, HEAD differs from the tagged commit. Checking
out the tag directly ensures GoReleaser validates correctly.

Author: dndungu

.github/workflows/release-please.yml

@@ -31,6 +31,7 @@ jobs:
       - uses: actions/checkout@v4
         with:
           fetch-depth: 0
+          ref: ${{ needs.release-please.outputs.tag_name }}
 
       - uses: actions/setup-go@v5
         with: