fix: for code scanning alert no. 5: Incomplete multi-character sanitization (#1403)

Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>

Author: Ffloriel

packages/vue-cli-plugin-purgecss/generator/templates/postcss.config.js

@@ -6,10 +6,15 @@ module.exports = {
       require("@fullhuman/postcss-purgecss")({
         content: [`./public/**/*.html`, `./src/**/*.vue`],
         defaultExtractor(content) {
-          const contentWithoutStyleBlocks = content.replace(
-            /<style[^]+?<\/style>/gi,
-            ""
-          );
+          let previous;
+          let contentWithoutStyleBlocks = content;
+          do {
+            previous = contentWithoutStyleBlocks;
+            contentWithoutStyleBlocks = contentWithoutStyleBlocks.replace(
+              /<style[^]+?<\/style>/gi,
+              ""
+            );
+          } while (contentWithoutStyleBlocks !== previous);
           return (
             contentWithoutStyleBlocks.match(
               /[A-Za-z0-9-_/:]*[A-Za-z0-9-_/]+/g