Update spellcheck comment

Author: svekars

.github/workflows/spelling.yml

@@ -147,7 +147,7 @@ jobs:
       - name: Check for existing comment
         if: |
           github.event_name == 'pull_request' &&
-          steps.spellcheck.outputs.spell_failed == 'true'
+          steps.spellcheck.outcome == 'failure'
         uses: actions/github-script@v6
         id: find-comment
         with:
@@ -169,7 +169,7 @@ jobs:
       - name: Post or update spell check comment
         if: |
           github.event_name == 'pull_request' &&
-          steps.spellcheck.outputs.spell_failed == 'true'
+          steps.spellcheck.outcome == 'failure'
         uses: actions/github-script@v6
         with:
           script: |