Invert stale condition

There seems to be a bug in current actions/stale and it uses the default
value for checking actual staleness of an issue. So use the lower value
there. This will make marking PRs as stale earlier, but we don't have
any stale right now. Hopefully it will get properly fixed in the action.

See actions/stale#304
See actions/stale#299

.github/workflows/stale.yml

@@ -17,10 +17,10 @@ jobs:
     steps:
       - uses: actions/stale@v3.0.15
         with:
-          days-before-stale: 30
-          days-before-close: 14
-          days-before-issue-stale: 10
-          days-before-issue-close: 4
+          days-before-pr-stale: 30
+          days-before-pr-close: 14
+          days-before-stale: 10
+          days-before-close: 4
           exempt-issue-labels: bug,enhancement,documentation,security
           stale-issue-label: wontfix
           stale-pr-label: wontfix