Update Rust to the latest version (#143)

* build: update to Rust 1.97

Signed-off-by: Jérémy Audiger <jeremy.audiger@icloud.com>

* build: update transient deps

Signed-off-by: Jérémy Audiger <jeremy.audiger@icloud.com>

---------

Signed-off-by: Jérémy Audiger <jeremy.audiger@icloud.com>

Author: jaudiger

.github/workflows/ci.yml

@@ -11,7 +11,7 @@ concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
 
 env:
-  NIGHTLY_TOOLCHAIN: nightly-2026-06-15
+  NIGHTLY_TOOLCHAIN: nightly-2026-07-01
   # Default environment variables for Cargo
   CARGO_INCREMENTAL: "0"
   CARGO_PROFILE_DEV_DEBUG: "false"