chore(deps): bump ember-data from 4.12.5 to 4.12.8

Bumps [ember-data](https://github.com/emberjs/data/tree/HEAD/packages/-ember-data) from 4.12.5 to 4.12.8.
- [Release notes](https://github.com/emberjs/data/releases)
- [Changelog](https://github.com/emberjs/data/blob/main/CHANGELOG.md)
- [Commits](https://github.com/emberjs/data/commits/v4.12.8/packages/-ember-data)

---
updated-dependencies:
- dependency-name: ember-data
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

Diff for: package.json

@@ -50,7 +50,7 @@
     "ember-cli-showdown": "^9.0.1",
     "ember-composable-helpers": "^5.0.0",
     "ember-concurrency": "^4.0.2",
-    "ember-data": "^4.12.5",
+    "ember-data": "^4.12.8",
     "ember-data-resources": "^5.2.1",
     "ember-engines-router-service": "^0.6.0",
     "ember-fetch": "^8.1.2",