[Pkg-rust-maintainers] Bug#1061127: rust-loom: remove the patch that skips env-logger feature of tracing_subscriber

[Fab Stz]

Source: rust-loom
Version: 0.5.6-2
Severity: minor
block -1 by 1053420

Dear Maintainer,

This is just a reminder that in 0.5.6-2 we added a patch to fix the FTBFS
described in #1054724.

This patch should be removed whenever possible, ie. when tracing_subscriber
ships the env-logger feature again.

This depends on: #1053420 & https://github.com/hawkw/matchers/pull/4

more info also in https://salsa.debian.org/rust-team/debcargo-conf/-/merge_requests/593