chore: Upgrade ctor to 0.2.0

[audunhalland]

ctor released version 0.2.0 which bumps the syn version to 2.x. Not sure why ctor needed to bump to a non-backwards-compatible release. There doesn't seem to be any other changes than just internal dependency upgrades.

[tommilligan]

Hi @audunhalland, thanks for picking this up. There's a failure in the Windows CI indicating this is a breaking change somehow - I'm not sure what the context really is, can you offer any insight?

I'm open to the CI being updated as well, as it's pretty old at this point.

[audunhalland]

Unfortunately I don't use windows :(

I was just looking at my lock file trying to phase out various uses of syn 1.x.

[tommilligan]

Ah okay. I mean if you don't use Windows, you won't end up compiling syn 1.x anyway, though I agree it's nice to keep things up to date.

I had a dig into why we even use ctor and what it does, IMO it's actually not a nice solution and we could replace it with something like once_cell at runtime. However, as I also don't use windows/powershell, I'm inclined to not touch it for now until someone who does use Windows complains at me.

Closing unless further interested is expressed from Windows users

[tommilligan]

ctor has been removed in v1.4.0