acp: Update the ACP SDK to 2.2.0 (#64457)

Pick up the published ACP Rust SDK 2.2.0 release, including the schema
1.9.1 compatibility fix for agents returning `null` for
empty/defaultable payloads.

Upstream changes:
- https://github.com/agentclientprotocol/agent-client-protocol/pull/2178
- https://github.com/agentclientprotocol/rust-sdk/pull/367

Release Notes:

- acp: Fixed errors when ACP agents return `null` for empty response
payloads.

Cargo.lock

@@ -326,9 +326,9 @@ dependencies = [
 
 [[package]]
 name = "agent-client-protocol"
-version = "2.1.0"
+version = "2.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6395d81d91fd2ee93f48ea31cfc511356e75b9061ca0389cefd0308507cc11ba"
+checksum = "13f780597b2c88ab83d02509bcc3e86366751f86fa12114005e35c55ed691763"
 dependencies = [
  "agent-client-protocol-derive",
  "agent-client-protocol-schema",
@@ -350,9 +350,9 @@ dependencies = [
 
 [[package]]
 name = "agent-client-protocol-derive"
-version = "2.1.0"
+version = "2.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7e8d5f32208cdc11238004bec4e4229d68fb937598f900e153468ca084865fa5"
+checksum = "f4893bfb11e0e193aa5a64611a126ee87567acb1879556519c902722899229de"
 dependencies = [
  "quote",
  "syn 3.0.3",
@@ -360,9 +360,9 @@ dependencies = [
 
 [[package]]
 name = "agent-client-protocol-schema"
-version = "1.7.0"
+version = "1.9.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ca98360c7bb8cc97d7acd49e2a8a851c3f7bee6b2f0535036d8ab86b5fcd223d"
+checksum = "1d595a79e1665d02c91c7dd1bedd118501e75cc0a3d5b1651b5150ec4c5c1e0d"
 dependencies = [
  "anyhow",
  "derive_more",

Cargo.toml

@@ -518,7 +518,7 @@ accesskit = { version = "0.24.0", features = ["enumn"] }
 accesskit_macos = "0.26.0"
 accesskit_unix = "0.22"
 accesskit_windows = "0.34"
-agent-client-protocol = { version = "=2.1.0", features = ["unstable"] }
+agent-client-protocol = { version = "=2.2.0", features = ["unstable"] }
 aho-corasick = "1.1"
 alacritty_terminal = { git = "https://github.com/zed-industries/alacritty", rev = "4c129667ce56611becdc82de6e28218c80e2e88f" }
 any_vec = "0.14"