ci: workflow permissions updated

Author: Raj-StepSecurity

.github/workflows/check-upgrades.yml

@@ -6,13 +6,9 @@ on:
       python-version:
         required: true
         type: string
-permissions:
-  contents: read
 
 jobs:
   check:
-    permissions:
-      contents: read  # for actions/checkout to fetch code
     name: Check (Python ${{ matrix.python-version }})
     runs-on: ubuntu-latest
     strategy: