DEV: Lock @glimmer/syntax to 0.93.1 (#31037)

Cross-ref:
https://github.com/discourse/discourse/pull/31003,
https://github.com/discourse/discourse/pull/31025,
https://github.com/discourse/discourse/pull/31033

app/assets/javascripts/discourse-widget-hbs/package.json

@@ -24,7 +24,7 @@
     "@ember/optional-features": "^2.2.0",
     "@embroider/test-setup": "^4.0.0",
     "@glimmer/component": "^1.1.2",
-    "@glimmer/syntax": "^0.93.1",
+    "@glimmer/syntax": "0.93.1",
     "broccoli-asset-rev": "^3.0.0",
     "ember-cli": "~6.1.0",
     "ember-cli-inject-live-reload": "^2.1.0",

app/assets/javascripts/discourse/package.json

@@ -16,7 +16,7 @@
   },
   "dependencies": {
     "@faker-js/faker": "^9.4.0",
-    "@glimmer/syntax": "^0.93.1",
+    "@glimmer/syntax": "0.93.1",
     "@highlightjs/cdn-assets": "11.11.1",
     "@json-editor/json-editor": "2.15.2",
     "@messageformat/core": "^3.4.0",