build(deps): bump julia-actions/setup-julia from 2 to 3

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>

Author: dependabot[bot]

.github/workflows/CompatHelper.yml

@@ -13,7 +13,7 @@ jobs:
   CompatHelper:
     runs-on: ubuntu-latest
     steps:
-      - uses: julia-actions/setup-julia@5c9647d97b78a5debe5164e9eec09d653d29bd71
+      - uses: julia-actions/setup-julia@f6f565d9f7cf12f53dc8045742460d6260ad3b39
         with:
           version: 1.3
       - name: Pkg.add("CompatHelper")

.github/workflows/Downgrade.yml

@@ -20,7 +20,7 @@ jobs:
         julia-version: ['1.10']
     steps:
       - uses: actions/checkout@v6
-      - uses: julia-actions/setup-julia@v2
+      - uses: julia-actions/setup-julia@v3
         with:
           version: ${{ matrix.julia-version }}
       - uses: julia-actions/julia-downgrade-compat@v2