Bump julia-actions/setup-julia from 2 to 3 (#18)

Bumps [julia-actions/setup-julia](https://github.com/julia-actions/setup-julia) from 2 to 3.
- [Release notes](https://github.com/julia-actions/setup-julia/releases)
- [Commits](julia-actions/setup-julia@v2...v3)

---
updated-dependencies:
- dependency-name: julia-actions/setup-julia
  dependency-version: '3'
  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

@@ -51,7 +51,7 @@ jobs:
     - uses: actions/checkout@v6
       with:
         persist-credentials: false
-    - uses: julia-actions/setup-julia@v2
+    - uses: julia-actions/setup-julia@v3
       with:
         version: ${{ matrix.version }}
     - uses: julia-actions/julia-runtest@v1