fix(brotli) remove re2 dependency

[yigaldviri]

Use a fixed version of re2 to maintain support for Node14 (now need 14.21.3)

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[yigaldviri]

Hi @titanism - can we merge it? It will help to keep support for Node 14 as well

[titanism]

It looks like this causes problems on some architectures, so we may need to look at an alternative.

#1814

At a glance, it seems like the regular expressions here are actually safe:

https://github.com/ladjs/superagent/blob/134cdd7c4fd57868c80102826507047da23c34aa/src/utils.js#L121-L139

> require('safe-regex2')(/^\s*(?:deflate|gzip)\s*$/)
true
> require('safe-regex2')(/^\s*(?:br)\s*$/)
true

So we may not need RE2 after all. Though this might need tested.

[yigaldviri]

@titanism - I removed re2. we have unit tests around that area

[titanism]

superagent v10.0.1 is released (we removed re2 dependency)

https://github.com/ladjs/superagent/releases/tag/v10.0.1