Build(deps-dev): Bump @embroider/core from 3.4.3 to 3.4.8

Bumps [@embroider/core](https://github.com/embroider-build/embroider/tree/HEAD/packages/core) from 3.4.3 to 3.4.8.
- [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/core)

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

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

package.json

@@ -44,7 +44,7 @@
     "@ember/string": "^3.1.1",
     "@ember/test-helpers": "^2.9.4",
     "@embroider/compat": "^3.4.3",
-    "@embroider/core": "^3.4.3",
+    "@embroider/core": "^3.4.8",
     "@embroider/webpack": "^3.2.1",
     "@gavant/glint-template-types": "^0.4.0",
     "@glimmer/component": "^1.1.2",