Revert "Try to fix ghcup cache in CI via sudo chmod"

This reverts commit 0bb71d1.

Author: Mikolaj

.github/workflows/validate.yml

@@ -57,11 +57,6 @@ jobs:
 
       - uses: actions/checkout@v3
 
-      - name: Sudo chmod to permit ghcup to update its cache
-        run: |
-          sudo mkdir -p /usr/local/.ghcup/cache
-          sudo chmod -R g+wr /usr/local/.ghcup/cache
-
       - uses: haskell/actions/setup@v2
         id: setup-haskell
         with: