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/check.yml

@@ -69,7 +69,7 @@ jobs:
           token: ${{ secrets.CODECOV_TOKEN }}
       - name: Collect coverage reports
         if: inputs.collect-code-coverage && github.actor != 'dependabot[bot]'
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: coverage-reports
           path: '**/build/reports/kover/report.xml'

.github/workflows/pull_request.yml

@@ -19,7 +19,7 @@ jobs:
       run: |
         mkdir -p ./pr
         echo $PR_NUMBER > ./pr/pr_number
-    - uses: actions/upload-artifact@v5
+    - uses: actions/upload-artifact@v6
       with:
         name: pr_number
         path: pr/