update Dockerfile to use rustc 1.61

diff --git a/Dockerfile b/Dockerfile
index 501a2dce6cef95c27ea14e51e3fff8d087415082..661ff5d0aa40cb98f84cfd6394c221ee92c4f741 100755 (executable)
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 # See https://github.com/LukeMathWalker/cargo-chef
-ARG RUST_VERSION=1.60-buster
+ARG RUST_VERSION=1.61-buster
 FROM rust:${RUST_VERSION} as planner
 WORKDIR /scryer-prolog
 RUN cargo install cargo-chef