Bump julia-actions/setup-julia from 1 to 2 (#433)

Bumps [julia-actions/setup-julia](https://github.com/julia-actions/setup-julia) from 1 to 2.
- [Release notes](https://github.com/julia-actions/setup-julia/releases)
- [Commits](julia-actions/setup-julia@v1...v2)

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

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

Author: dependabot[bot]

.github/workflows/CompatHelper.yml

@@ -16,7 +16,7 @@ jobs:
         run : |
           version=$(grep '^julia = ' Project.toml | grep -o '".*"' | cut -d '"' -f2)
           echo "::set-output name=version::$version"
-      - uses: julia-actions/setup-julia@v1
+      - uses: julia-actions/setup-julia@v2
         with:
           version: ${{ steps.julia_compat.outputs.version }}
       - name: Install CompatHelper