ci(deps): Bump actions/upload-artifact from 4 to 6

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 4 to 6.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v4...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>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -56,7 +56,7 @@ jobs:
 
       - name: Upload test results
         if: always()
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: test-results-${{ matrix.os }}-jdk-${{ matrix.java-version }}
           path: |
@@ -65,7 +65,7 @@ jobs:
 
       - name: Upload coverage reports
         if: matrix.os == 'ubuntu-latest' && matrix.java-version == '21'
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: coverage-report
           path: |
@@ -75,7 +75,7 @@ jobs:
         run: ./gradlew check --no-daemon
 
       - name: Upload build artifacts
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: build-artifacts-${{ matrix.os }}-jdk-${{ matrix.java-version }}
           path: |

.github/workflows/publish.yml

@@ -62,7 +62,7 @@ jobs:
           GITHUB_ACTOR: ${{ github.actor }}
 
       - name: Upload build artifacts
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: published-artifacts-${{ steps.get_version.outputs.version }}
           path: |