npm install fails due to conflicting peer dependency

`ts-emit-clean` has a peer dependency on `typescript@^3.0.0` that conflicts with our devDependency on `typescript@4.5.2`. This breaks `npm install`.

```console
$ git clone https://github.com/benjamn/ast-types.git

$ cd ast-types

$ npm install
npm ERR! code ERESOLVE
npm ERR! ERESOLVE could not resolve
npm ERR!
npm ERR! While resolving: ts-emit-clean@1.0.0
npm ERR! Found: typescript@4.5.2
npm ERR! node_modules/typescript
npm ERR! dev typescript@"4.5.2" from the root project
npm ERR! peer typescript@">=2.7" from ts-node@10.4.0
npm ERR! node_modules/ts-node
npm ERR! dev ts-node@"10.4.0" from the root project
npm ERR!
npm ERR! Could not resolve dependency:
npm ERR! peer typescript@"^3.0.0" from ts-emit-clean@1.0.0
npm ERR! node_modules/ts-emit-clean
npm ERR! dev ts-emit-clean@"1.0.0" from the root project
npm ERR!
npm ERR! Conflicting peer dependency: typescript@3.9.10
npm ERR! node_modules/typescript
npm ERR! peer typescript@"^3.0.0" from ts-emit-clean@1.0.0
npm ERR! node_modules/ts-emit-clean
npm ERR! dev ts-emit-clean@"1.0.0" from the root project
npm ERR!
npm ERR! Fix the upstream dependency conflict, or retry
npm ERR! this command with --force, or --legacy-peer-deps
npm ERR! to accept an incorrect (and potentially broken) dependency resolution.
npm ERR!
npm ERR! See /home/anders/.npm/eresolve-report.txt for a full report.

npm ERR! A complete log of this run can be found in:
npm ERR! /home/anders/.npm/_logs/2022-05-25T21_45_28_938Z-debug-0.log

$ node --version
v16.15.0

$ npm --version
8.10.0
```

(Also affects recast. I won’t bother filing a separate issue unless you want one.)

Reproduce the failure with npm install using Node v16.15.0 and npm 8.10.0, then inspect the dependency declarations for ts-emit-clean and TypeScript. Resolve the peer-dependency conflict without --force or --legacy-peer-deps, and verify that installation completes; check whether the same dependency issue affects recast.

Written by the indexing model from the issue text.