Update Dockerfile.rust (#14)

upgrade rust version for new clap version min compiler version requirement.

builder/Dockerfile.rust

@@ -2,7 +2,7 @@
 # Xet services. Instead of baking the dependencies and caches into
 # the image, we leverage the host system's build cache to store the
 # intermediate artifacts using a volume for Cargo's target directory.
-FROM rust:1.72
+FROM rust:1.77
 
 
 RUN USER=root rustup component add rustfmt