fix: only retrieve PR commits

Author: patheard

.github/workflows/conventional-commit-lint.yml

@@ -7,14 +7,11 @@ jobs:
   conventional-commit-lint:
     runs-on: ubuntu-latest
     steps:
-    - name: Get all PR commits + 1
-      run: echo "PR_FETCH_DEPTH=$(( ${{ github.event.pull_request.commits }} + 1 ))" >> "${GITHUB_ENV}"
-
     - name: Checkout
       uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
       with:
         ref: ${{ github.event.pull_request.head.ref }}
-        fetch-depth: ${{ env.PR_FETCH_DEPTH }}      
+        fetch-depth: ${{ github.event.pull_request.commits }}
 
     - name: Setup Node.js
       uses: actions/setup-node@60edb5dd545a775178f52524783378180af0d1f8 # v4.0.2