Use ref_name as head to compare commits in release as well

Author: vinistock

.github/workflows/release.yml

@@ -28,7 +28,7 @@ jobs:
               owner: context.repo.owner,
               repo: context.repo.repo,
               base: previousRelease.tag_name,
-              head: "${{ github.ref }}"
+              head: "${{ github.ref_name }}"
             });
 
             const pullRequests = [];