ci: Better commit message

.github/workflows/update-snapshots/action.yml

@@ -70,7 +70,7 @@ runs:
         base: ${{ github.head_ref }}
         branch: snapshot-${{ github.ref_name }}-${{ github.job }}-${{ steps.matrix-desc.outputs.branch }}
         delete-branch: true
-        title: Snapshot updates for ${{ github.job }} (${{ steps.matrix-desc.outputs.text }})
+        title: "test: Snapshot updates for ${{ github.job }} (${{ steps.matrix-desc.outputs.text }})"
         body: "Automated changes by [create-pull-request](https://github.com/peter-evans/create-pull-request) GitHub action${{ github.event.number && format(' for #{0}', github.event.number) || '' }}."
         add-paths: |
           tests/testthat/_snaps