Bump the all-github-actions group in /.github/workflows with 2 updates (#382)

Bumps the all-github-actions group in /.github/workflows with 2 updates: [actions/upload-artifact](https://github.com/actions/upload-artifact) and [actions/download-artifact](https://github.com/actions/download-artifact).


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

Updates `actions/download-artifact` from 7 to 8
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v7...v8)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: all-github-actions
- dependency-name: actions/download-artifact
  dependency-version: '8'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: all-github-actions
...

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

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -198,7 +198,7 @@ jobs:
         if: matrix.build_testing == 'OFF' && matrix.build_type == 'Debug'
         # If we use the build with testing ON, we'd also need to copy over (and
         # install) the libtdms.so so use the OFF build for simplicity.
-        uses: actions/upload-artifact@v6
+        uses: actions/upload-artifact@v7
         with:
           name: tdms_build_${{ matrix.os }}
           path: ${{ runner.workspace }}/build/tdms_build.tar
@@ -234,7 +234,7 @@ jobs:
           python3 -m pip install -r ${GITHUB_WORKSPACE}/tdms/tests/requirements.txt
 
       - name: Download build result
-        uses: actions/download-artifact@v7
+        uses: actions/download-artifact@v8
         with:
           name: tdms_build_${{ matrix.os }}
           path: ${{ runner.workspace }}