chore: remove workaround for "Excessive Stack Depth" from TS3.2

this was added to our typing to work around issue described in
microsoft/TypeScript#21592 - however, as of TS 3.6.3 it has not been
an issue

src/find-options/FindConditions.ts

@@ -4,5 +4,5 @@ import {FindOperator} from "./FindOperator";
  * Used for find operations.
  */
 export type FindConditions<T> = {
-    [P in keyof T]?: T[P] extends never ? FindConditions<T[P]>|FindOperator<FindConditions<T[P]>> : FindConditions<T[P]>|FindOperator<FindConditions<T[P]>>;
+    [P in keyof T]?: FindConditions<T[P]> | FindOperator<FindConditions<T[P]>>;
 };