message: use no-self-update
diff: @@ -18,7 +18,7 @@ steps:
  set -e
  rustup set profile minimal
  rustup component remove --toolchain=$TOOLCHAIN rust-docs || echo "already removed"
  - rustup update $TOOLCHAIN
  + rustup update --no-self-update $TOOLCHAIN
  rustup default $TOOLCHAIN
  displayName: Install rust
  