Fixed rust version to 1.77 because of https://bugs.ruby-lang.org/issues/20506

Author: moritzheiber

Dockerfile

@@ -31,7 +31,7 @@ RUN apt-get update && \
 	libffi-dev \
 	zlib1g-dev \
 	libssl-dev && \
-	curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --profile minimal --default-toolchain stable && \
+	curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --profile minimal --default-toolchain=1.77.0 && \
 	source "${HOME}/.cargo/env" && \
 	curl -L -o "ruby-${RUBY_VERSION}.tar.gz" "https://cache.ruby-lang.org/pub/ruby/${RUBY_VERSION%.*}/ruby-${RUBY_VERSION}.tar.gz" && \
 	echo "${RUBY_CHECKSUM}  ruby-${RUBY_VERSION}.tar.gz" | sha256sum --strict -c - && \