Typescript - reference to dom and AbortSignal

[Luzgan]

Describe the bug
Typescript having problems with AbortSignal types, which I believe is a type from dom types. From what I see it was added in 2c1d2ab and removed in d69af6f#diff-093ad82a25aee498b11febf1cdcb6546e4d223ffcb49ed69cc275ac27ce0ccceL2
but reference to AbortSignal type stayed in there.

Environment:

• openid-client version: [v5.0.2]
• node version: [v12.19.0]

[panva]

AbortSignal is added as a global in Node.js 16, bumping your @types/node to 16.x will help out. I don't think I can make it so that you can stay on older versions.

[Luzgan]

Hm. Bumping types to 16, while using 12 seems wrong. I guess you should update readme, with a mention that node 16 is supported, nothing below.

[panva]

The supported runtimes are correct as-is. @types/node is not a runtime.

[Luzgan]

Fair enough, but maybe mention typescript problem at least :)