.github/workflows/ci.yml: try updating actions from v3 to v4

.github/workflows/ci.yml

@@ -40,7 +40,7 @@ jobs:
 #          - {platform: centos7-container,         os: ubuntu-20.04, experimental: false}
     steps:
       - name: Checkout sources
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Fix local hostname DNS lookup
         run: echo 127.0.1.1 $(hostname --fqdn) $(hostname) | sudo tee -a /etc/hosts
@@ -72,7 +72,7 @@ jobs:
         # always() is required here to run this step even if the build fails
         # otherwise the platform will be skipped in the test report (it should be flagged as broken)
         if: always()
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: build-${{ matrix.platform }}
           path: artifacts/build
@@ -94,7 +94,7 @@ jobs:
 
       - name: Upload test results
         if: always() && steps.init_qa.outcome == 'success'
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: test-${{ matrix.platform }}
           path: artifacts/test