fix(template/gulpfile): fix missing `os` and `exec`dependencies in `gulpfile.js` when not skipping styles-related code generation
fix(template/gulpfile): fix missing `os` and `exec`dependencies in `gulpfile.js` when not skipping styles-related code generation

tinesoft/generator-ngx-library,tinesoft/generator-ngx-library,tinesoft/generator-ngx-library,tinesoft/generator-ng-plugin,tinesoft/generator-ng-plugin,tinesoft/generator-ngx-library,tinesoft/generator-ng-plugin