Refresh example certificates

[djc]

Fixes #173. This is basically a simplified version of https://github.com/rustls/rustls/tree/main/test-ca.

[djc]

@cpu would you be able to dig into these macOS CI failures? FWIW the tests pass locally on my macOS machine (ran them like ~10 times).

[cpu]

@cpu would you be able to dig into these macOS CI failures? FWIW the tests pass locally on my macOS machine (ran them like ~10 times).

I will take a look today 👍 I don't have super convenient access to MacOS machines locally but it sounds like that won't help in this case. I'll see what I can figure out.

[cpu]

I'll see what I can figure out.

The problem is not related to this PR (it reproduces on main). I was able to trace this down to a bugfix in curl v7.88.0+. Only the MacOS builder is using this curl version (the Linux instances are on 7.58.0).

I think this is safe to merge whenever it gets a +1 from a maintainer. I'll open a separate PR in the next hour or two with more information on what's going on with curl 7.88 and a fix.

[cpu]

I'll open a separate PR in the next hour or two with more information on what's going on with curl 7.88 and a fix.

#193

[cpu]

Merging with one review since this is just test data.