Update dependency @glint/core to ^2.0.0-alpha.12

Author: renovate[bot]

package.json

@@ -98,7 +98,7 @@
     "@embroider/vite": "^1.3.0",
     "@glimmer/component": "^2.0.0",
     "@glimmer/interfaces": "^0.94.6",
-    "@glint/core": "^2.0.0-alpha.4",
+    "@glint/core": "^2.0.0-alpha.12",
     "@glint/environment-ember-loose": "^2.0.0-alpha.3",
     "@glint/environment-ember-template-imports": "^2.0.0-alpha.3",
     "@glint/template": "^1.6.1",