Bump julia-actions/setup-julia from 1.9.2 to 2.0.0 (#722)

Bumps [julia-actions/setup-julia](https://github.com/julia-actions/setup-julia) from 1.9.2 to 2.0.0.
- [Release notes](https://github.com/julia-actions/setup-julia/releases)
- [Commits](julia-actions/setup-julia@f40c4b6...f225878)

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

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

Author: dependabot[bot]

.github/workflows/exercise-tests.yml

@@ -28,7 +28,7 @@ jobs:
     steps:
       - uses: actions/checkout@9bb56186c3b09b4f86b1c65136769dd318469633
 
-      - uses: julia-actions/setup-julia@f40c4b69330df1d22e7590c12e76dc2f9c66e0bc
+      - uses: julia-actions/setup-julia@f2258781c657ad9b4b88072c5eeaf9ec8c370874
         with:
           version: ${{ matrix.julia-version }}