Bump actions/upload-artifact from 5 to 6 (#3688)

Author: dependabot[bot]

.github/workflows/build.yml

@@ -141,7 +141,7 @@ jobs:
         run: dotnet pack --configuration Release --property:PackageOutputPath="$PWD/nupkgs" --version-suffix "ci.$(date -u +%Y%m%dT%H%M%S)+sha.${GITHUB_SHA:0:9}" -p:ContinuousIntegrationBuild=true
 
       - name: Upload artifacts
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: EFCore.PG.CI
           path: nupkgs
@@ -173,7 +173,7 @@ jobs:
         run: dotnet pack --configuration Release --property:PackageOutputPath="$PWD/nupkgs" -p:ContinuousIntegrationBuild=true
 
       - name: Upload artifacts
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: EFCore.PG.Release
           path: nupkgs