Introspection produces unexpected results after upgrading to 1.2.0-rc.1

**Describe the Bug**
After upgrading to 1.2.0-rc.1, when GraphQL Playground runs an introspection query, it will complain about input types that have no fields.

**To Reproduce**
Create an input type where all fields are deprecated.

**Expected Behavior**
The deprecated fields are returned, the introspection succeeds and GraphQL Playground is able to operate normally.

**Environment (please complete the following information):**

- OS: Windows WSL
- Node 16.x
- Package version 1.2.0-rc.1
- TypeScript version 4.5.4

**Additional Context**
From what I understand, this is likely caused by the graphql-js upgrade. I found https://github.com/graphql/graphql-js/issues/2834 which hints at this issue. I found no way how to affect this behavior from type-graphql itself.

Start by reproducing the introspection query in GraphQL Playground with an input type whose fields are all deprecated, using package version 1.2.0-rc.1 and the reported TypeScript and Node versions. Read the linked graphql-js issue #2834 and compare the graphql-js upgrade behavior. Done means deprecated fields are returned, introspection succeeds, and GraphQL Playground operates normally.

Written by the indexing model from the issue text.