Bump @stencil/core from 4.20.0 to 4.21.0

Bumps [@stencil/core](https://github.com/ionic-team/stencil) from 4.20.0 to 4.21.0.
- [Release notes](https://github.com/ionic-team/stencil/releases)
- [Changelog](https://github.com/ionic-team/stencil/blob/main/CHANGELOG.md)
- [Commits](stenciljs/core@v4.20.0...v4.21.0)

---
updated-dependencies:
- dependency-name: "@stencil/core"
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

packages/stencil-library/package.json

@@ -35,7 +35,7 @@
   "devDependencies": {
     "@chromatic-com/storybook": "^1.5.0",
     "@stencil-community/eslint-plugin": "0.8.0",
-    "@stencil/core": "4.20.0",
+    "@stencil/core": "4.21.0",
     "@stencil/react-output-target": "^0.5.1",
     "@stencil/sass": "^3.0.4",
     "@storybook/addon-a11y": "^8.3.2",