ci(build-packages): rm rebar.lock in prepare phase

.github/workflows/build_packages.yaml

@@ -42,6 +42,7 @@ jobs:
         if: endsWith(github.repository, 'emqx')
         run: |
           make -C source deps-all
+          rm source/rebar.lock
           zip -ryq source.zip source/* source/.[^.]*
       - name: get_all_deps
         if: endsWith(github.repository, 'enterprise')