Bump julia-actions/julia-format from 3 to 4 (#7)

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

---
updated-dependencies:
- dependency-name: julia-actions/julia-format
  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/format-julia.yaml

@@ -26,7 +26,7 @@ jobs:
   format:
     runs-on: ubuntu-latest
     steps:
-      - uses: julia-actions/julia-format@v3
+      - uses: julia-actions/julia-format@v4
         with:
           # Version compat for JuliaFormatter.jl (default: '1')
           # E.g. set to '1.0.54' if you need to use JuliaFormatter.jl v1.0.54