chore(deps): update actions/checkout action to v5

Author: renovate[bot]

.github/workflows/nightly.yml

@@ -16,7 +16,7 @@ jobs:
       contents: read
     steps:
       - name: Checkout
-        uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4
+        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5
 
       - name: Check if we had commits in the past month
         continue-on-error: true