Add missing type:module to issue 952 test (#2989)

found during #2988 

<!-- This is an auto-generated comment: release notes by coderabbit.ai
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## Summary by CodeRabbit

- New Features
  - None.

- Chores
- Updated the project to use ES modules via package configuration,
aligning imports/exports with modern module semantics and runtime
resolution.

- Impact
- No changes to user-facing features or UI. Behavior should remain the
same for typical usage; only module loading and import/export mechanics
are affected under the hood.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Author: RobinTail

issue952-test/package.json

@@ -2,6 +2,7 @@
   "name": "issue952-test",
   "private": true,
   "version": "0.0.0",
+  "type": "module",
   "scripts": {
     "test": "tsc -p tsconfig.json",
     "posttest": "rm *.d.ts"