Bump julia-actions/setup-julia from 2 to 3 (#268)

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -47,7 +47,7 @@ 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