Bump julia-actions/julia-buildpkg from 1.4.3 to 1.5.0 (#68)

Bumps [julia-actions/julia-buildpkg](https://github.com/julia-actions/julia-buildpkg) from 1.4.3 to 1.5.0.
- [Release notes](https://github.com/julia-actions/julia-buildpkg/releases)
- [Commits](julia-actions/julia-buildpkg@v1.4.3...v1.5.0)

---
updated-dependencies:
- dependency-name: julia-actions/julia-buildpkg
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

.github/workflows/CI.yml

@@ -41,7 +41,7 @@ jobs:
             ${{ runner.os }}-test-${{ env.cache-name }}-
             ${{ runner.os }}-test-
             ${{ runner.os }}-
-      - uses: julia-actions/julia-buildpkg@v1.4.3
+      - uses: julia-actions/julia-buildpkg@v1.5.0
       - run: |
           git config --global user.name Tester
           git config --global user.email te@st.er