refactor: remove deprecated scopeId codegen

BREAKING CHANGE: Output of SFC using `<style scoped>` generated by 3.2+
will be incompatible w/ runtime <3.2.

packages/compiler-sfc/src/compileScript.ts

@@ -148,15 +148,6 @@ export function compileScript(
     )
   }
 
-  // TODO remove on 3.2
-  if (sfc.template && sfc.template.attrs['inherit-attrs'] === 'false') {
-    warnOnce(
-      `Experimental support for <template inherit-attrs="false"> support has ` +
-        `been removed. Use a <script> block with \`export default\` to ` +
-        `declare options.`
-    )
-  }
-
   const scopeId = options.id ? options.id.replace(/^data-v-/, '') : ''
   const cssVars = sfc.cssVars
   const scriptLang = script && script.lang