Bump actions/upload-artifact from 6 to 7

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 6 to 7.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](https://github.com/actions/upload-artifact/compare/v6...v7)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Closes #33

Change-Id: I0cc0add8232d05963750a260ba2119e5e63ae5ec
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6381817..0d22dbb 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -21,7 +21,7 @@
       - name: Run tests
         run: ./gradlew test --no-daemon
       - name: Upload build artifacts
-        uses: actions/upload-artifact@v6
+        uses: actions/upload-artifact@v7
         with:
           name: korapxmltool-jar
           path: app/build/libs/*.jar