Dockerfile: upgrade nightly toolchain to 2023-02-28

Author: lpenz

Dockerfile

@@ -3,6 +3,7 @@
 # file 'LICENSE', which is part of this source code package.
 
 # Adapted from https://github.com/rust-lang/docker-rust/blob/master/Dockerfile-slim.template
+# Nightly version from https://rust-lang.github.io/rustup-components-history/
 
 FROM debian:bullseye-slim
 
@@ -22,7 +23,7 @@ RUN set -eux; \
         ; \
     sed -i '/pam_rootok.so$/aauth sufficient pam_permit.so' /etc/pam.d/su; \
     wget https://sh.rustup.rs -O rustup-init; \
-    bash rustup-init -y --no-modify-path --profile minimal --default-toolchain nightly-2022-10-25; \
+    bash rustup-init -y --no-modify-path --profile minimal --default-toolchain nightly-2023-02-28; \
     rm rustup-init; \
     chmod -R a+w $RUSTUP_HOME $CARGO_HOME; \
     rustup --version; \