Update dependency ember-repl to v6

Author: renovate[bot]

package.json

@@ -233,7 +233,7 @@
       "@glint/environment-ember-template-imports": "unstable",
       "@glint/template": "unstable",
       "@ember/render-modifier": "^2.1.0",
-      "ember-repl": "5.0.1",
+      "ember-repl": "6.0.0",
       "ember-source": "6.4.0-alpha.3"
     },
     "patchedDependencies": {