chore(deps): update dependency ember-simple-tree to ^0.8.4 (#9157)

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

Author: renovate[bot]

pnpm-lock.yaml

@@ -67,7 +67,7 @@
     "ember-maybe-import-regenerator": "^1.0.0",
     "ember-qunit": "^8.0.2",
     "ember-resolver": "^11.0.1",
-    "ember-simple-tree": "^0.8.3",
+    "ember-simple-tree": "^0.8.4",
     "ember-source": "~5.4.0",
     "loader.js": "^4.7.0",
     "qunit": "^2.20.0",

tests/embroider-basic-compat/package.json

@@ -65,7 +65,7 @@
     "ember-maybe-import-regenerator": "^1.0.0",
     "ember-qunit": "^8.0.2",
     "ember-resolver": "^11.0.1",
-    "ember-simple-tree": "^0.8.3",
+    "ember-simple-tree": "^0.8.4",
     "ember-source": "~5.4.0",
     "loader.js": "^4.7.0",
     "qunit": "^2.20.0",