CI: Upgrade from setup-julia@v2 to v3

Author: DilumAluthge

.github/workflows/ci.yml

@@ -34,7 +34,7 @@ jobs:
           - false
     steps:
       - uses: actions/checkout@v6
-      - uses: julia-actions/setup-julia@v2
+      - uses: julia-actions/setup-julia@v3
         with:
           version: ${{ matrix.version }}
       - uses: julia-actions/cache@v3
@@ -57,7 +57,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6
-      - uses: julia-actions/setup-julia@v2
+      - uses: julia-actions/setup-julia@v3
         with:
           version: '1'
       - uses: julia-actions/cache@v3