Remove R cache

Author: Heliozoa

.github/workflows/test.yml

@@ -64,12 +64,6 @@ jobs:
         with:
           dotnet-version: "5.0.x"
 
-      - name: Cache R packages
-        if: matrix.os == 'ubuntu-latest'
-        uses: actions/cache@v1
-        with:
-          path: ${{ env.R_LIBS_USER }}
-          key: r-${{ hashFiles('DESCRIPTION') }}
       - name: Install R
         if: matrix.os == 'ubuntu-latest'
         uses: r-lib/actions/setup-r@v1