chore(deps-dev): bump @storybook/ember from 6.4.20 to 7.6.2

Bumps [@storybook/ember](https://github.com/storybookjs/storybook/tree/HEAD/code/frameworks/ember) from 6.4.20 to 7.6.2.
- [Release notes](https://github.com/storybookjs/storybook/releases)
- [Changelog](https://github.com/storybookjs/storybook/blob/next/CHANGELOG.md)
- [Commits](https://github.com/storybookjs/storybook/commits/v7.6.2/code/frameworks/ember)

---
updated-dependencies:
- dependency-name: "@storybook/ember"
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

package.json

@@ -42,7 +42,7 @@
     "@storybook/addon-docs": "^6.4.20",
     "@storybook/addon-essentials": "^6.4.20",
     "@storybook/addon-links": "^6.4.20",
-    "@storybook/ember": "^6.4.20",
+    "@storybook/ember": "^7.6.2",
     "@storybook/ember-cli-storybook": "^0.5.0",
     "autoprefixer": "^10.3.6",
     "babel-loader": "^8.2.2",