Bump julia-actions/setup-julia from 2.6 to 3

Bumps [julia-actions/setup-julia](https://github.com/julia-actions/setup-julia) from 2.6 to 3.
- [Release notes](https://github.com/julia-actions/setup-julia/releases)
- [Commits](julia-actions/setup-julia@v2.6...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>

Author: dependabot[bot]

.github/workflows/CI.yml

@@ -24,7 +24,7 @@ jobs:
           - x64
     steps:
       - uses: actions/checkout@v6
-      - uses: julia-actions/setup-julia@v2.6
+      - uses: julia-actions/setup-julia@v3
         with:
           version: ${{ matrix.version }}
           arch: ${{ matrix.arch }}

.github/workflows/docs.yml

@@ -18,7 +18,7 @@ jobs:
         os: [ubuntu-latest]
     steps:
       - uses: actions/checkout@v6
-      - uses: julia-actions/setup-julia@v2.6
+      - uses: julia-actions/setup-julia@v3
         with:
           version: ${{ matrix.julia-version }}
       - name: Install dependencies