chore(deps): update actions/checkout action to v4

Author: renovate[bot]

.github/workflows/docs.yml

@@ -10,7 +10,7 @@ jobs:
         runs-on: ubuntu-latest
         steps:
             - name: Check out code
-              uses: actions/checkout@v3
+              uses: actions/checkout@v4
               with:
                   fetch-depth: 2
 

.github/workflows/test.yml

@@ -17,7 +17,7 @@ jobs:
 
         steps:
             - name: Check out code
-              uses: actions/checkout@v3
+              uses: actions/checkout@v4
               with:
                   fetch-depth: 2