Update dependency ember-data to v5.6.0 (#1433)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package.json

@@ -70,7 +70,7 @@
     "ember-cli-deploy-git-ci": "1.0.1",
     "ember-cli-htmlbars": "6.3.0",
     "ember-cli-inject-live-reload": "2.1.0",
-    "ember-data": "5.5.0",
+    "ember-data": "5.6.0",
     "ember-eslint": "^0.5.0",
     "ember-load-initializers": "2.1.2",
     "ember-qunit": "8.1.1",