Fix availability macro definition for AsyncAlgorithms 1.3

[azarovalex]

In Package.swift AsyncAlgorithms_v1_3 defines the availability domain as AsyncAlgorithms 1.2 instead of AsyncAlgorithms 1.3.

[azarovalex]

@phausler looking at this more it seems that the whole #else branch is dead code since // swift-tools-version: 6.2 is defined for this manifest? It feels like we can remove #if compiler(>=6.0) && swift(>=6.0) check unless I'm missing something

[phausler]

@swift-ci please test

[azarovalex]

@phausler thanks for triggering CI, it seems like it is broken for quite some time tho and failures are not related to thisPR.
I published a new PR that should hopefully fix macOS CI: #409
Linux pipeline seems to have a compiler crash so likely not something we could fix in this repo

[phausler]

That linux crash is really gnarly! Have you made a ticket already on the swift repo GH issues? 'cause that is definitely a huge regression

[azarovalex]

@phausler
Okay I found a two line repro for the crash and opened a new issue in the swift repo: swiftlang/swift#88530

I see the crash happens on macOS too in the separate PR where I try to fix macOS CI, I added a one line workaround there: #409, we'd need to land that PR first to unblock this one.