CI: Bump rust versions (#42)

#### Problem

We need to publish spl-transfer-hook-cli, but the semver checks job is
failing due to an old Rust version.

#### Summary of changes

Update to the Rust versions tied to v2.3 of Agave.

Cargo.toml

@@ -26,8 +26,8 @@ solana = "2.2.0"
 # Specify Rust toolchains for rustfmt, clippy, and build.
 # Any unprovided toolchains default to stable.
 [workspace.metadata.toolchains]
-format = "nightly-2024-11-22"
-lint = "nightly-2024-11-22"
+format = "nightly-2025-02-16"
+lint = "nightly-2025-02-16"
 
 [workspace.metadata.spellcheck]
 config = "scripts/spellcheck.toml"

rust-toolchain.toml

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