Update actions/checkout action to v4

Author: renovate[bot]

Diff for: .github/workflows/license-check.yml

@@ -14,7 +14,7 @@ jobs:
       contents: write
       pull-requests: write
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
 

Diff for: .github/workflows/update-license-year.yml

@@ -12,7 +12,7 @@ jobs:
       contents: write
       pull-requests: write
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0