Bump gap-actions/run-pkg-tests from 3 to 4 (#26)

Bumps [gap-actions/run-pkg-tests](https://github.com/gap-actions/run-pkg-tests) from 3 to 4.
- [Commits](gap-actions/run-pkg-tests@v3...v4)

---
updated-dependencies:
- dependency-name: gap-actions/run-pkg-tests
  dependency-version: '4'
  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>

Author: dependabot[bot]

.github/workflows/CI.yml

@@ -37,5 +37,5 @@ jobs:
         with:
           gap-version: ${{ matrix.gap-version }}
       - uses: gap-actions/build-pkg@v2
-      - uses: gap-actions/run-pkg-tests@v3
+      - uses: gap-actions/run-pkg-tests@v4
       - uses: ./this-action/