Bump Rust toolchain to 1.85

[Mallets]

Umbrella issue covering all PRs for the Zenoh project:

• zenoh Bump Rust toolchain to 1.85 #1803
• zenoh-c Bump Rust toolchain to 1.85 zenoh-c#933
• zenoh-cpp
  • Run Sync Cargo.lock CI action once Bump Rust toolchain to 1.85 zenoh-c#933 is merged
• zenoh-python Bump Rust toolchain to 1.85 zenoh-python#462
• zenoh-java Bump Rust toolchain to 1.85 zenoh-java#211
• zenoh-kotlin Bump Rust toolchain to 1.85 zenoh-kotlin#403
• zenoh-ts Bump Rust toolchain to 1.85 zenoh-ts#145
• zenoh-plugin-mqtt Bump Rust toolchain to 1.85 zenoh-plugin-mqtt#345
• zenoh-plugin-webserver Bump Rust toolchain to 1.85 zenoh-plugin-webserver#283
• zenoh-plugin-dds Bump Rust toolchain to 1.85 zenoh-plugin-dds#449
• zenoh-plugin-ros1 Bump Rust toolchain to 1.85 zenoh-plugin-ros1#226
• zenoh-plugin-ros2dds Bump Rust toolchain to 1.85 zenoh-plugin-ros2dds#414
• zenoh-backend-rocksdb Bump Rust toolchain to 1.85 zenoh-backend-rocksdb#323
• zenoh-backend-influxdb Bump Rust toolchain to 1.85 zenoh-backend-influxdb#352
• zenoh-backend-filesystem Bump Rust toolchain to 1.85 zenoh-backend-filesystem#322
• zenoh-backend-s3 Bump Rust toolchain to 1.85 zenoh-backend-s3#294
• zenoh-dissector Bump Rust toolchain to 1.85 zenoh-dissector#69

See ros/rosdistro#44640 for rustup progress in ROS2.

[kydos]

This cannot and shall not be done before the ROS2 kilted kaju release. Once ROS2 kilted kaju is out, we'll have to maintain a ROS2 branch on 1.75 and may evolve the main. But that has to be done with great care and coordination.