Update github actions workflow.

Author: jdumas

.github/workflows-open/gh-pages.yml

@@ -16,7 +16,6 @@ jobs:
         uses: prefix-dev/setup-pixi@v0.9.1
         with:
           pixi-version: v0.55.0
-          cache: true
 
       - name: Build website
         shell: bash -l {0}