ci: change filter script to ESM format

Because `"type": "module"` was added to `package.json`

Author: cotes2020

.github/workflows/pr-filter.yml

@@ -21,5 +21,5 @@ jobs:
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
           script: |
-            const script = require('.github/workflows/scripts/pr-filter.js');
-            await script({ github, context, core });
+            const { default: filter } = await import('${{ github.workspace }}/.github/workflows/scripts/pr-filter.js');
+            await filter({ github, context, core });

.github/workflows/scripts/pr-filter.js

@@ -9,7 +9,7 @@ function hasDescription(markdown) {
   );
 }
 
-module.exports = async ({ github, context, core }) => {
+export default async ({ github, context, core }) => {
   const pr = context.payload.pull_request;
   const body = pr.body === null ? '' : pr.body;
   const markdown = body.replace(/<!--[\s\S]*?-->/g, '');