Fetch latest tag via gh API in semver workflow

The semver action does its own full checkout, so the calling workflow
doesn't need one. Use `gh api` to fetch the latest tag instead.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: Not-Nik

.github/workflows/semver.yml

@@ -20,15 +20,12 @@ jobs:
       run:
         shell: bash
     steps:
-      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
-        with:
-          persist-credentials: false
-          fetch-depth: 0
-
       - name: Get latest tag
         id: tag
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |
-          echo "ref=$(git describe --tags --abbrev=0)" >> "$GITHUB_OUTPUT"
+          echo "ref=$(gh api "repos/$GITHUB_REPOSITORY/tags" --jq '.[0].name')" >> "$GITHUB_OUTPUT"
 
       - uses: mozilla/actions/nss@25cb84d060946c0ad6d2c3f79da479b16d180d71 # v1.1.0
         with: