fix: remove phantom cyclic deps (@pgpmjs/core -> migrate-client, graphile-settings -> pgsql-test)

Break the cyclic dependency chain that prevented pgsql-test from building
in CI. The cycle was:

  pgsql-client -> @pgpmjs/core -> @pgpmjs/migrate-client ->
  @constructive-io/graphql-query -> graphile-settings -> pgsql-test ->
  pgsql-client

Both removed deps were phantom (declared but never imported in source):
- @pgpmjs/core listed @pgpmjs/migrate-client as a production dep but
  never imports it in src/
- graphile-settings listed pgsql-test as a devDep but never imports it
  in src/

Author: pyramation

graphile/graphile-settings/package.json

@@ -75,7 +75,6 @@
     "graphile-test": "workspace:^",
     "makage": "^0.3.0",
     "nodemon": "^3.1.14",
-    "pgsql-test": "workspace:^",
     "ts-node": "^10.9.2"
   },
   "keywords": [

pgpm/core/package.json

@@ -50,7 +50,6 @@
   "dependencies": {
     "@pgpmjs/env": "workspace:^",
     "@pgpmjs/logger": "workspace:^",
-    "@pgpmjs/migrate-client": "workspace:^",
     "@pgpmjs/server-utils": "workspace:^",
     "@pgpmjs/types": "workspace:^",
     "csv-to-pg": "workspace:^",