[isTypeReadonly] Unions are always marked as readonly

[RebeccaStevens]

• I have tried restarting my IDE and the issue persists.
• I have updated to the latest version of the packages.
• I have read the FAQ and my problem is not listed.

Repro

type TestType = string[] | number[]

isTypeReadonly(checker, type, {})

Expected Result

isTypeReadonly should return false

Actual Result

isTypeReadonly returns true for any union

Additional Info

Predicate always return true:

typescript-eslint/packages/type-utils/src/isTypeReadonly.ts

Lines 193 to 196 in 97c0e86

	t =>
	seenTypes.has(t) ||
	isTypeReadonlyRecurser(checker, t, options, seenTypes),
	);

Versions

package	version
@typescript-eslint/type-utils	5.9.0
@typescript-eslint/type-utils	5.9.0
TypeScript	4.5.4
node	17.1.0

Also note the error in the template in Versions: @typescript-eslint/type-utils's version is requested twice. I assume there is supposed to be only one or one is supposed to be @typescript-eslint/experimental-utils