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](https://github.com/actions/upload-artifact/compare/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] <support@github.com>

.github/workflows/ResInsightWithCache.yml

@@ -252,14 +252,14 @@ jobs:
 
       - name: Upload python distribution folder
         if: matrix.config.publish-to-pypi
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: python-distribution
           path: GrpcInterface/Python/dist
           retention-days: 5
 
       - name: Upload artifacts
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: ResInsight-${{ matrix.config.name }}
           path: ${{ runner.workspace }}/ResInsight/cmakebuild/install

.github/workflows/centos7.yml

@@ -90,7 +90,7 @@ jobs:
           ls
 
       - name: Upload artifact
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: ResInsight
           path: ./cmakebuild/packages