ci: only check conventional commits since last tag

.github/workflows/check.yml

@@ -31,6 +31,7 @@ jobs:
           fetch-depth: 0
           # pick the pr HEAD instead of the merge commit only if it's a PR, otherwise use the default
           ref: ${{ github.event.pull_request.head.sha || github.sha }}
+          check-latest-tag-only: true
 
       - name: Conventional commit check
         uses: cocogitto/cocogitto-action@v3