`[project]` Upgrade `transit-cljs` dep

[harold]

https://github.com/JulianBirch/cljs-ajax/blob/359e83ca0cd628c22252ba861860cb921622a618/project.clj#L9

Hi!

Thanks for this project - we use it every day in our work and have for a long time and it's amazing.

I wonder about upgrading the transit-cljs dep here, since this is where our frontends get that lib from.

It looks like the latest release (as of the time of this issue) is: [com.cognitect/transit-cljs "0.8.280"]

In particular, getting this fix (introduced in June 2022) would be great:

• https://github.com/cognitect/transit-cljs/commit/1af34dc9a034c07caaa1bf090df0aad80f599002

Thanks again for everything. You're rad.