fix comparison used to determine change in invalidations (#20)

Author: KristofferC

README.md

@@ -54,7 +54,7 @@ jobs:
         echo "Invalidations on default branch: ${{ steps.invs_default.outputs.total }} (${{ steps.invs_default.outputs.deps }} via deps)" >> $GITHUB_STEP_SUMMARY
         echo "This branch: ${{ steps.invs_pr.outputs.total }} (${{ steps.invs_pr.outputs.deps }} via deps)" >> $GITHUB_STEP_SUMMARY
     - name: Check if the PR does increase number of invalidations
-      if: steps.invs_pr.outputs.total > steps.invs_default.outputs.total
+      if: ${{ fromJSON(steps.invs_pr.outputs.total) > fromJSON(steps.invs_default.outputs.total) }}
       run: exit 1
 ```