CI: fetch tags for release dry-run validation

PR #2177 made the release workflow checkout shallow, so the dry-run tag validation now needs tags fetched explicitly while keeping history shallow.

Author: rwgk

.github/workflows/release.yml

@@ -87,7 +87,9 @@ jobs:
       - name: Checkout Source
         uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10  # v6.0.3
         with:
+          # Dry-run validation resolves the requested tag locally; we need tags but not history.
           fetch-depth: 1
+          fetch-tags: true
 
       - name: Check release tag and draft state
         env: