deps: Update Solana v2.3.4 and rust toolchain (#53)

#### Problem

The v2.3 Solana crates are out, and the toolchain on this repo is a bit old.

#### Summary of changes

Bump the Solana version, crates, and rust toolchain.

clients/rust/Cargo.toml

@@ -15,11 +15,11 @@ serde = ["dep:serde", "dep:serde_with", "kaigan/serde"]
 [dependencies]
 borsh = "^0.10"
 kaigan = "^0.2"
-num-derive = "^0.3"
+num-derive = "^0.4"
 num-traits = "^0.2"
 serde = { version = "^1.0", features = ["derive"], optional = true }
 serde_with = { version = "^3.0", optional = true }
-solana-client = { version = "2.2.0", optional = true }
+solana-client = { version = "2.3.4", optional = true }
 solana-sdk = { version = "2.2.1", optional = true }
 solana-program = "2.2.1"
 thiserror = "^1.0"

rust-toolchain.toml

@@ -1,2 +1,2 @@
 [toolchain]
-channel = "1.84.1"
+channel = "1.86.0"

vars.env

@@ -1,2 +1,2 @@
-RUST_TOOLCHAIN_NIGHTLY="nightly-2024-11-22"
-SOLANA_CLI_VERSION="2.2.0"
+RUST_TOOLCHAIN_NIGHTLY="nightly-2025-02-16"
+SOLANA_CLI_VERSION="2.3.4"