chore(deps): update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/ci.yml

@@ -11,7 +11,7 @@ jobs:
       run:
         working-directory: scripts
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions/setup-node@v5
         with:
           node-version: lts/*

.github/workflows/most-helpful-contributors.yml

@@ -12,7 +12,7 @@ jobs:
       run:
         working-directory: scripts
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions/setup-node@v5
         with:
           node-version: lts/*