Set maximum compression for CI artifacts

- Changed compression-level from 0 to 9 for AnyKernel3 artifacts
- Reduces download size when accessing artifacts from Actions tab
- Release assets remain properly single-zipped via main.yml workflow

.github/workflows/build.yml

@@ -531,7 +531,7 @@ jobs:
         with:
           name: WKSU-${{ env.KSUVER }}-${{ inputs.android_version }}-${{ inputs.kernel_version }}.${{ env.ACTUAL_SUBLEVEL || inputs.sub_level }}-${{ inputs.os_patch_level }}-${{ matrix.apply_module_check_bypass && 'Module_Check_Bypass' || 'Normal' }}-AnyKernel3
           path: AnyKernel3/
-          compression-level: 0
+          compression-level: 9
 
       - name: Upload Patch Rejects (if any)
         if: ${{ always() && env.REJ_COUNT != '0' }}