chore: update Rollup to v4 (#5510)

Co-authored-by: Mark Wiemer <7833360+mark-wiemer@users.noreply.github.com>
Co-authored-by: Josh Goldberg ✨ <git@joshuakgoldberg.com>

Author: 3 people

eslint.config.js

@@ -60,7 +60,7 @@ module.exports = [
   {
     files: [
       "lib/nodejs/esm-utils.js",
-      "rollup.config.js",
+      "rollup.config.mjs",
       "scripts/*.mjs",
       "scripts/pick-from-package-json.js",
       "test/compiler-cjs/test.js",
@@ -176,6 +176,9 @@ module.exports = [
       "test/integration/fixtures/**",
       ".karma/**",
       "mocha.js",
+      // TODO: ESLint v8 parser can't parse Import attributes
+      "rollup.config.mjs",
+      "scripts/pick-from-package-json.mjs",
     ],
   },
 ];

karma.conf.js

@@ -52,7 +52,7 @@ const baseConfig = {
     rollupPlugin,
   ],
   rollup: {
-    configFile: "rollup.config.js",
+    configFile: "rollup.config.mjs",
     include: ["test/**"],
   },
   reporters: ["mocha"],