Bump rollup from 3.20.6 to 3.21.0 in /js (#19906)

Bumps [rollup](https://github.com/rollup/rollup) from 3.20.6 to 3.21.0.
- [Release notes](https://github.com/rollup/rollup/releases)
- [Changelog](https://github.com/rollup/rollup/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rollup/rollup/compare/v3.20.6...v3.21.0)

---
updated-dependencies:
- dependency-name: rollup
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

js/libs/keycloak-js/package.json

@@ -48,7 +48,7 @@
     "@rollup/plugin-terser": "^0.4.1",
     "@rollup/plugin-typescript": "^11.1.0",
     "es6-promise": "^4.2.8",
-    "rollup": "^3.20.6"
+    "rollup": "^3.21.0"
   },
   "dependencies": {
     "base64-js": "^1.5.1",

js/package-lock.json

@@ -156,7 +156,7 @@
         "@rollup/plugin-terser": "^0.4.1",
         "@rollup/plugin-typescript": "^11.1.0",
         "es6-promise": "^4.2.8",
-        "rollup": "^3.20.6"
+        "rollup": "^3.21.0"
       }
     },
     "libs/keycloak-masthead": {
@@ -9231,9 +9231,9 @@
       }
     },
     "node_modules/rollup": {
-      "version": "3.20.6",
-      "resolved": "https://registry.npmjs.org/rollup/-/rollup-3.20.6.tgz",
-      "integrity": "sha512-2yEB3nQXp/tBQDN0hJScJQheXdvU2wFhh6ld7K/aiZ1vYcak6N/BKjY1QrU6BvO2JWYS8bEs14FRaxXosxy2zw==",
+      "version": "3.21.0",
+      "resolved": "https://registry.npmjs.org/rollup/-/rollup-3.21.0.tgz",
+      "integrity": "sha512-ANPhVcyeHvYdQMUyCbczy33nbLzI7RzrBje4uvNiTDJGIMtlKoOStmympwr9OtS1LZxiDmE2wvxHyVhoLtf1KQ==",
       "dev": true,
       "bin": {
         "rollup": "dist/bin/rollup"