Bump MSRV to 1.85.0 (#3936)

This is to introduce the 2024 edition which will help with dependency
maintenance.

Author: UebelAndre

.bazelci/presubmit.yml

@@ -17,8 +17,8 @@ aspects_flags: &aspects_flags
   - "--config=rustfmt"
   - "--config=clippy"
 min_rust_version_shell_commands: &min_rust_version_shell_commands
-  - sed -i 's|^rust_register_toolchains(|rust_register_toolchains(versions = ["1.74.0"],\n|' WORKSPACE.bazel
-  - sed -i 's|^rust\.toolchain(|rust.toolchain(versions = ["1.74.0"],\n|' MODULE.bazel
+  - sed -i 's|^rust_register_toolchains(|rust_register_toolchains(versions = ["1.85.0"],\n|' WORKSPACE.bazel
+  - sed -i 's|^rust\.toolchain(|rust.toolchain(versions = ["1.85.0"],\n|' MODULE.bazel
 nightly_flags: &nightly_flags
   - "--//rust/toolchain/channel=nightly"
 nightly_aspects_flags: &nightly_aspects_flags