[internal] Normalize Action description

Author: oliviertassinari

.github/workflows/maintenance.yml

@@ -28,7 +28,7 @@ jobs:
       pull-requests: write
     steps:
       - run: echo "${{ github.actor }}"
-      - name: check if prs are dirty
+      - name: Check if prs are dirty
         uses: eps1lon/actions-label-merge-conflict@1df065ebe6e3310545d4f4c4e862e43bdca146f0 # v3.0.3
         with:
           dirtyLabel: 'PR: out-of-date'

.github/workflows/mark-duplicate.yml

@@ -13,7 +13,7 @@ jobs:
       contents: read
       issues: write
     steps:
-      - name: mark-duplicate
+      - name: Mark duplicate
         uses: actions-cool/issues-helper@a610082f8ac0cf03e357eb8dd0d5e2ba075e017e # v3.6.0
         with:
           actions: 'mark-duplicate'