4.5.5 doesn't support "extends": "@tsconfig/node12/tsconfig.json",

[zxxc]

Describe the bug
I updated from 4.5.4 to 4.5.5 and migrations stopped working

Stack trace

> node node_modules/.bin/mikro-orm migration:up

(node:12927) UnhandledPromiseRejectionWarning: Error: ENOENT: no such file or directory, open '/Users/aklamer/Documents/GitHub/integrationhub/@tsconfig/node12/tsconfig.json'
(node:12927) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
(node:12927) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

tsconfig:

{
  "extends": "@tsconfig/node12/tsconfig.json",
  "compilerOptions": {
    "experimentalDecorators": true,
    "emitDecoratorMetadata": true,
    "types": ["mocha"],
    "sourceMap": true
  },
  "exclude": ["node_modules"]
}

To Reproduce
Steps to reproduce the behavior:

1. npm install @tsconfig/node12 --save-dev
2. use tsconfig from example above with extends
3. use mikro-orm 4.5.5
4. try to apply migrations

Expected behavior
Successfully migrated up to the latest version

Additional context
Add any other context about the problem here.

Versions

 "@mikro-orm/core": "4.5.5",
    "@mikro-orm/migrations": "4.5.5",
    "@mikro-orm/postgresql": "4.5.5",
   "@mikro-orm/cli": "4.5.5",
    "@tsconfig/node12": "^1.0.7",
 "typescript": "^4.2.4"
node -v: v12.16.3```

[B4nan]

cc @Langstra this is probably caused by the change you did

[B4nan]

4.5.6-dev.6