Merge pull request #1166 from alphagov/sengi/release-tagging-robustness

Fix `Calculate new verion tag` release step.

.github/workflows/release.yml

@@ -13,6 +13,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
         with:
+          fetch-depth: 0
           show-progress: false
           ref: ${{ github.event.workflow_run.head_commit.id }}