Merge pull request #1706 from glimmerjs/fix-glimmer-interfaces-exports

Fix @glimmer/interfaces exports

Author: NullVoxPopuli

packages/@glimmer/interfaces/package.json

@@ -8,7 +8,9 @@
     "directory": "packages/@glimmer/interfaces"
   },
   "type": "module",
-  "exports": "./index.d.ts",
+  "exports": {
+    ".": "./index.d.ts"
+  },
   "publishConfig": {
     "access": "public"
   },