fix(graphql): bump tsx version to get around esbuild vulnerability (#14207)

Fixes #14190

Bumps tsx to `4.20.6` which uses a newer version of esbuild without this
vulnerability GHSA-67mh-4wv8-2f99

- [x] To do: Test with a canary release in an end project
- [x] Tested custom bin script

Author: paulpopus

packages/graphql/package.json

@@ -56,7 +56,7 @@
     "graphql-scalars": "1.22.2",
     "pluralize": "8.0.0",
     "ts-essentials": "10.0.3",
-    "tsx": "4.19.2"
+    "tsx": "4.20.6"
   },
   "devDependencies": {
     "@payloadcms/eslint-config": "workspace:*",