Test newer setup-racket version

Author: haglobah

.github/workflows/pages.yml

@@ -32,13 +32,13 @@ jobs:
       url: ${{ steps.deployment.outputs.page_url }}
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
-      - uses: Bogdanp/setup-racket@v1.9
+      - uses: actions/checkout@master
+      - uses: Bogdanp/setup-racket@v1.11
         with:
           architecture: 'x64'
           distribution: 'full'
           variant: 'CS'
-          version: 'stable'
+          version: '8.11'
       - uses: actions/cache@v2
         with:
           path: |