Remove issues: write permission (#22)

Remove `issues: write` permission from the workflow since it's not
needed.

Author: MariusStorhaug

.github/workflows/Process-PSModule.yml

@@ -20,7 +20,6 @@ concurrency:
 
 permissions:
   contents: write
-  issues: write
   pull-requests: write
   statuses: write
   pages: write