`@wry/caches` is not compatible with `moduleResolution = node16`

Trying to use `@wry/caches` in a package with `moduleResolution` set to `node16` (or `nodenext`) fails with the errors:

```
node_modules/@wry/caches/lib/strong.d.ts:1:34 - error TS2835: Relative import paths need explicit file extensions in ECMAScript imports when '--moduleResolution' is 'node16' or 'nodenext'. Did you mean './common.js'?

1 import type { CommonCache } from "./common";
~~~~~~~~~~

node_modules/@wry/caches/lib/weak.d.ts:1:34 - error TS2835: Relative import paths need explicit file extensions in ECMAScript imports when '--moduleResolution' is 'node16' or 'nodenext'. Did you mean './common.js'?

1 import type { CommonCache } from "./common";
~~~~~~~~~~
```

Start by inspecting node_modules/@wry/caches/lib/strong.d.ts and lib/weak.d.ts, especially their relative imports of ./common. Reproduce the failure with TypeScript using moduleResolution node16 or nodenext, then verify that the published declarations compile without TS2835 errors.

Written by the indexing model from the issue text.