Bump actions/upload-artifact from 5 to 6

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 5 to 6.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v5...v6)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/maven-build.yml

@@ -31,7 +31,7 @@ jobs:
     - name: upload workspace if build fails
       # if: ${{ failure() }}
       if: ${{ false }}
-      uses: actions/upload-artifact@v5
+      uses: actions/upload-artifact@v6
       with:
         name: build-results
         path: .

.github/workflows/maven-release.yml

@@ -73,7 +73,7 @@ jobs:
         mvn package -DskipTests -P fatjar -f karate-core/pom.xml
         mvn package -DskipTests -P fatjar -f karate-robot/pom.xml
     - name: upload binaries
-      uses: actions/upload-artifact@v5
+      uses: actions/upload-artifact@v6
       with: 
         name: karate-release-${{ github.event.inputs.version }}
         retention-days: 5