build: remove GO111MODULE env as it is default on

Signed-off-by: Rui Chen <rui@chenrui.dev>

.github/workflows/test.yml

@@ -182,8 +182,6 @@ jobs:
       run: script/source-setup/go
     - name: Run tests
       run: script/test go
-      env:
-        GO111MODULE: "on"
 
   gradle:
     runs-on: ubuntu-latest