chore(deps-dev): bump @embroider/webpack in the embroider group

Bumps the embroider group with 1 update: [@embroider/webpack](https://github.com/embroider-build/embroider/tree/HEAD/packages/webpack).


Updates `@embroider/webpack` from 4.0.8 to 4.0.9
- [Release notes](https://github.com/embroider-build/embroider/releases)
- [Changelog](https://github.com/embroider-build/embroider/blob/main/CHANGELOG.md)
- [Commits](https://github.com/embroider-build/embroider/commits/HEAD/packages/webpack)

---
updated-dependencies:
- dependency-name: "@embroider/webpack"
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: embroider
...

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

package.json

@@ -48,7 +48,7 @@
     "@embroider/compat": "^3.7.1",
     "@embroider/core": "^3.4.16",
     "@embroider/router": "^2.1.8",
-    "@embroider/webpack": "^4.0.8",
+    "@embroider/webpack": "^4.0.9",
     "@glimmer/component": "^1.1.2",
     "@glimmer/tracking": "^1.1.2",
     "@glint/core": "^1.5.0",