fix: 变量 libName 是中横线字符，demo 页面读取时报错。

Author: dear-lizhihua

packages/@vue/cli-service/lib/commands/build/demo-lib-js.html

@@ -7,5 +7,5 @@
 <% } %>
 
 <script>
-console.log(<%- htmlWebpackPlugin.options.libName %>)
+console.log(globalThis['<%- htmlWebpackPlugin.options.libName %>'])
 </script>

packages/@vue/cli-service/lib/commands/build/demo-lib.html

@@ -15,13 +15,13 @@
 <% if (htmlWebpackPlugin.options.vueMajor === 3) { %>
 Vue.createApp({
   components: {
-    demo: <%- htmlWebpackPlugin.options.libName %>
+    demo: globalThis['<%- htmlWebpackPlugin.options.libName %>']
   }
 }).mount('#app')
 <% } else { %>
 new Vue({
   components: {
-    demo: <%- htmlWebpackPlugin.options.libName %>
+    demo: globalThis['<%- htmlWebpackPlugin.options.libName %>']
   }
 }).$mount('#app')
 <% } %>