CI: Change setup-julia@latest to setup-julia@v2 (#138)

Author: DilumAluthge

.github/workflows/Documenter.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: julia-actions/setup-julia@latest
+      - uses: julia-actions/setup-julia@v2
         with:
           version: '1'
       - name: Install dependencies