chore: upgrade Bun from 1.3.3 to 1.3.9

Fixes CI test failures caused by Bun 1.3.3 test runner bugs with
cross-file mock isolation and test ordering. All 1600 tests pass
on 1.3.8+.

Author: BYK

package.json

@@ -59,7 +59,7 @@
   "engines": {
     "node": ">=22"
   },
-  "packageManager": "bun@1.3.3",
+  "packageManager": "bun@1.3.9",
   "patchedDependencies": {
     "@stricli/core@1.2.5": "patches/@stricli%2Fcore@1.2.5.patch",
     "@sentry/core@10.38.0": "patches/@sentry%2Fcore@10.38.0.patch"