chore: alter stale bot exempt tags

The stale bot was not exempting any of the labels we intended to be exempt

The previous "pin" tag wasn't working at all
The needs review tag was incorrect (blocked vs workflow)
The %20 escapes are not needed in practice

Author: mikehardy

.github/workflows/stale.yml

@@ -30,8 +30,8 @@ jobs:
             If you think this is a mistake please comment and ping a maintainer to get this merged ASAP! Thanks for contributing!
 
             You have 15 days until this gets closed automatically
-          exempt-issue-labels: '📌%20pin,Help:%20Good%20First%20Issue,Blocked:%20Needs%20Review'
-          exempt-pr-labels: '📌%20pin,Help:%20Good First%20Issue,Blocked:%20Needs%20Review'
+          exempt-issue-labels: 'Keep Open,Help: Good First Issue,Workflow: Needs Review'
+          exempt-pr-labels: 'Keep Open,Help: Good First Issue,Workflow: Needs Review'
           close-issue-reason: not_planned
           days-before-stale: 28
           days-before-close: 15