docker(deps): bump rust in /docker/ledger-integration-tests

Bumps rust from 1.85-bookworm to 1.93-bookworm.

---
updated-dependencies:
- dependency-name: rust
  dependency-version: 1.93-bookworm
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

docker/ledger-integration-tests/Dockerfile

@@ -1,6 +1,6 @@
 # Test runner for Control + Ledger integration tests
 
-FROM rust:1.85-bookworm
+FROM rust:1.93-bookworm
 
 RUN apt-get update && apt-get install -y --no-install-recommends \
     protobuf-compiler \