Replace isahc with async ureq (#18414)

REplace isahc with ureq everywhere gpui is used.

This should allow us to make http requests without libssl; and avoid a
long-tail of panics caused by ishac.

Release Notes:

- (potentially breaking change) updated our http client

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Co-authored-by: Mikayla <mikayla@zed.dev>

crates/vim/Cargo.toml

@@ -17,7 +17,7 @@ neovim = ["nvim-rs", "async-compat", "async-trait", "tokio"]
 
 [dependencies]
 anyhow.workspace = true
-async-compat = { version = "0.2.1", "optional" = true }
+async-compat = { workspace = true, "optional" = true }
 async-trait = { workspace = true, "optional" = true }
 collections.workspace = true
 command_palette.workspace = true