Changelog #286

#19793 keep derive macros when removing unused imports.

#19687 highlight unsafe operations as related when the caret is on unsafe.

#19801 improve asm! support.

#19794 don’t allow duplicate crates in the all_crates list.

#19807 don’t override RUSTUP_TOOLCHAIN if it is already set.

#19796 (first contribution) bump some dependencies for Cygwin support.

#19808 run metrics on the beta channel.