fix(NODE-4302): typo in typesVersions filename

[jablko]

Description

Older versions of TypeScript aren't working since #494 (comment) (BSON parser >= 4.6.3):

error TS7016: Could not find a declaration file for module 'bson'. 'node_modules/bson/lib/bson.js' implicitly has an 'any' type.

Looks like one instance was missed in 740ce30.

What is changing?

The typesVersions filename, so older versions of TypeScript can find the declaration file.

Is there new documentation needed for these changes?

No.

What is the motivation for this change?

I ran into this editing unrelated types on DefinitelyTyped that have a transitive dependency on BSON parser and are automatically tested on older versions of TypeScript. This typo causes that automation to complain, blocking edits to those transitively-dependent types.

[nbbeeken]

Hi @jablko surprisingly I believe that downleveling the types isn't actually doing anything necessary here (our library should work on TS v4.0.0+) I've started another PR (#501) where I'm testing against a range of TS versions and the nightly version.

If you still have your environment setup, can you see if locally removing the typesVersions alleviates the issue? if so we should be able to go with that approach in the next release.

[jablko]

@nbbeeken Thanks! You're right: I confirmed that dropping the typesVersions field entirely likewise fixes the issue.

Looks like the only difference in the downleveled types are the ambient get/set accessors, which aren't a problem for TS >=3.6.

I'll close this PR in favor of #501 (comment). 👍