deps: update base64 to 0.5.0

[nodejs-github-bot]

This is an automated update of base64 to 0.5.0.

[targos]

Removes config.h. /cc @facutuesca

[facutuesca]

Removes config.h. /cc @facutuesca

@targos Looks like config.h is not present in the upstream repo, but rather is a file that should be generated during build either with make or cmake.

Maybe it would make more sense to adapt Node's build to generate that file (instead of hardcoding it), since it's the workflow best supported by upstream?

[facutuesca]

@targos @jasnell Let's close this one, I created a PR here so that the script that updates base64 also creates the config.h file. With that change, the automatically-generated update PRs should work out of the box