fix: deduplicate graphql resolution and fix pg Client.connect() return type

- Add graphql@16.13.0 to pnpm.overrides to force single version resolution
  (was resolving to both 16.12.0 and 16.13.0, causing duplicate @dataplan/pg
  instances with incompatible PgExecutor private types)
- Fix pgsql-client connectPromise type: pg@8.19.0 changed Client.connect()
  return type from Promise<void> to Promise<Client>

Author: pyramation

package.json

@@ -48,7 +48,8 @@
   },
   "pnpm": {
     "overrides": {
-      "@dataplan/json": "1.0.0-rc.5"
+      "@dataplan/json": "1.0.0-rc.5",
+      "graphql": "16.13.0"
     },
     "publicHoistPattern": [
       "@jest/test-sequencer"