CI fix

Author: WardBrian

.github/workflows/main.yml

@@ -84,7 +84,7 @@ jobs:
 
       - name: Delete precompiled header (MacOS)
         if: matrix.os == 'macos-latest' && steps.cache-cmdstan.outputs.cache-hit == 'true'
-        run: rm -f ~/.cmdstan/cmdstan-${{ needs.get-cmdstan-version.outputs.version }}/stan/src/stan/model/*.hpp.gch
+        run: rm -rf ~/.cmdstan/cmdstan-${{ needs.get-cmdstan-version.outputs.version }}/stan/src/stan/model/*.hpp.gch
 
       - name: Install CmdStan (Linux, macOS)
         if: matrix.os != 'windows-latest'