Bump alacritty_terminal repo SHA (#59445)

See
https://github.com/zed-industries/alacritty/commit/4c129667ce56611becdc82de6e28218c80e2e88f.
The main change here is making `set_nonblocking` return `Result` rather
than panicking.

Closes FR-78.

Release Notes:

- N/A

Cargo.lock

@@ -607,7 +607,7 @@ dependencies = [
 [[package]]
 name = "alacritty_terminal"
 version = "0.26.1-dev"
-source = "git+https://github.com/zed-industries/alacritty?rev=fcf32feacb367b75ec84dd40f041e4fd411d3cc1#fcf32feacb367b75ec84dd40f041e4fd411d3cc1"
+source = "git+https://github.com/zed-industries/alacritty?rev=4c129667ce56611becdc82de6e28218c80e2e88f#4c129667ce56611becdc82de6e28218c80e2e88f"
 dependencies = [
  "base64 0.22.1",
  "bitflags 2.10.0",

Cargo.toml

@@ -505,7 +505,7 @@ accesskit_unix = "0.21.0"
 accesskit_windows = "0.33.1"
 agent-client-protocol = { version = "=0.14.0", features = ["unstable"] }
 aho-corasick = "1.1"
-alacritty_terminal = { git = "https://github.com/zed-industries/alacritty", rev = "fcf32feacb367b75ec84dd40f041e4fd411d3cc1" }
+alacritty_terminal = { git = "https://github.com/zed-industries/alacritty", rev = "4c129667ce56611becdc82de6e28218c80e2e88f" }
 any_vec = "0.14"
 anyhow = "1.0.86"
 ashpd = { version = "0.13", default-features = false, features = [