build(backend): Update Rust version (#2805)

Co-authored-by: juno-bot <juno-bot@users.noreply.github.com>

Author: github-actions[bot]

rust-toolchain.toml

@@ -1,3 +1,3 @@
 [toolchain]
-channel = "1.95.0"
+channel = "1.96.0"
 targets = ["wasm32-unknown-unknown", "wasm32-wasip1"]