Merge #429: ci, gha: Update actions/checkout actions

e6a9a70 ci, gha: Update `actions/checkout` actions (Hennadii Stepanov)

Pull request description:

ACKs for top commit:
  MarnixCroes:
    lgtm ACK e6a9a70
  jarolrod:
    ACK e6a9a70
  pablomartin4btc:
    ACK e6a9a70

Tree-SHA512: a3aedabcdf7e5bdb45be96f663be853848134c92a5fc582e96cd5a02967647ec407afd3b467c3b6c96bfdea4707ab5c2ff6156fd755d493dcbf7a5fcfc63d47c

Author: hebasto

.github/workflows/ci.yml

@@ -54,7 +54,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Clang version
         run: clang --version
@@ -105,7 +105,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Configure Developer Command Prompt for Microsoft Visual C++
         # Using microsoft/setup-msbuild is not enough.