add fetch

.github/workflows/release-notes-generator.yml

@@ -50,6 +50,7 @@ jobs:
       - name: Checkout main
         uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # Pin v4.1.1
         with:
+          fetch-depth: 0
           ref: main
 
       - name: Setup Python