build(deps-dev): bump vitest

Bumps [vitest](https://github.com/vitest-dev/vitest/tree/HEAD/packages/vitest) from 3.2.4 to 3.2.6.
- [Release notes](https://github.com/vitest-dev/vitest/releases)
- [Changelog](https://github.com/vitest-dev/vitest/blob/main/docs/releases.md)
- [Commits](https://github.com/vitest-dev/vitest/commits/v3.2.6/packages/vitest)

---
updated-dependencies:
- dependency-name: vitest
  dependency-version: 3.2.6
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

packages/dhkem-x25519/test/runtimes/cloudflare/package.json

@@ -13,7 +13,7 @@
     "@cloudflare/vitest-pool-workers": "~0.12.18",
     "@cloudflare/workers-types": "^4.20260305.0",
     "typescript": "^5.9.3",
-    "vitest": "3.2.4",
+    "vitest": "3.2.6",
     "wrangler": "^4.69.0"
   },
   "dependencies": {