workflow: when syncing local plugin deps, use minor version

because in the current release mechanism, patch version may be skipped.

Author: haoqunjiang

packages/@vue/cli-service/__tests__/Service.spec.js

@@ -62,7 +62,7 @@ test('loading plugins from package.json', () => {
   mockPkg({
     devDependencies: {
       'bar': '^1.0.0',
-      '@vue/cli-plugin-babel': '^3.2.2',
+      '@vue/cli-plugin-babel': '^3.2.0',
       'vue-cli-plugin-foo': '^1.0.0'
     }
   })

scripts/syncDeps.js

@@ -173,6 +173,10 @@ async function syncDeps ({ local, version, skipPrompt }) {
               return require(`../packages/${pkg}/package.json`).version
             }
 
+            if (pkg.includes('@vue/cli-plugin')) {
+              return `${semver.major(version)}.${semver.minor(version)}.0`
+            }
+
             // otherwise, inline version takes priority
             return version || require(`../packages/${pkg}/package.json`).version
           } catch (e) {}