Bump actions/upload-artifact from 3 to 4 (#108)

* Bump actions/upload-artifact from 3 to 4

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 3 to 4.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v3...v4)

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

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

* Bump actions/download-artifact from 3 to 4 (#107)

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 3 to 4.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v3...v4)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/ci.yml

@@ -149,7 +149,7 @@ jobs:
       - shell: bash
         run: |
           cp ./lcov.info ./lcov-${{ matrix.JULIA_P4EST_TEST }}-${{ matrix.os }}-${{ matrix.version }}-${{ matrix.arch }}.info
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           name: lcov-${{ matrix.JULIA_P4EST_TEST }}-${{ matrix.os }}-${{ matrix.version }}-${{ matrix.arch }}
           path: ./lcov-${{ matrix.JULIA_P4EST_TEST }}-${{ matrix.os }}-${{ matrix.version }}-${{ matrix.arch }}.info
@@ -172,7 +172,7 @@ jobs:
       # At first, we check out the repository and download all artifacts
       # (and list files for debugging).
       - uses: actions/checkout@v4
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v4
       - run: ls -R
       # Next, we merge the individual coverage files and upload
       # the combined results to Coveralls.
@@ -195,7 +195,7 @@ jobs:
           github-token: ${{ secrets.GITHUB_TOKEN }}
           path-to-lcov: ./lcov.info
       # Upload merged coverage data as artifact for debugging
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           name: lcov
           path: ./lcov.info