use upload v4

.github/workflows/pr-validation.yml

@@ -18,7 +18,7 @@ jobs:
         dotnet build dirs.proj
       env:
         DOTNET_ROLL_FORWARD: LatestMajor
-    - uses: actions/upload-artifact@v3
+    - uses: actions/upload-artifact@v4
       with: 
         name: tests
         path: bin\Debug\net6.0
@@ -48,7 +48,7 @@ jobs:
       env: 
         DOTNET_ROLL_FORWARD: LatestMajor
     - name: Upload test results
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with: 
         name: test-results-${{ matrix.sqlImage }}
         path: TestResults