Update actions/checkout action to v4 (#26882)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

.github/workflows/test-ruby.yml

@@ -32,7 +32,7 @@ jobs:
       SECRET_KEY_BASE: precompile_placeholder
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Set up Node.js
         uses: actions/setup-node@v3
@@ -127,7 +127,7 @@ jobs:
           - 3
           - 4
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - uses: actions/download-artifact@v3
         with:
@@ -202,7 +202,7 @@ jobs:
           - '.ruby-version'
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - uses: actions/download-artifact@v3
         with:
@@ -315,7 +315,7 @@ jobs:
           - '.ruby-version'
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - uses: actions/download-artifact@v3
         with: