Update dependency ember-cli to ~5.6.0 (#223)

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

Author: renovate[bot]

package.json

@@ -94,7 +94,7 @@
     "broccoli-asset-rev": "^3.0.0",
     "concurrently": "^8.2.2",
     "ember-auto-import": "^2.7.0",
-    "ember-cli": "~5.5.0",
+    "ember-cli": "~5.6.0",
     "ember-cli-clean-css": "^3.0.0",
     "ember-cli-content-security-policy": "^2.0.3",
     "ember-cli-dependency-checker": "^3.3.2",