Auto merge of #43485 - nrc:rls-env-fix, r=Mark-Simulacrum
Update RLS
This pulls in https://github.com/rust-lang-nursery/rls/commit/79d659e5699fbf7db5b4819e9a442fb3f550472a It should fix #43453. It increases the timeout for test runs and forces builds in RLS tests to happen sequentially, this prevents interference between env vars passed to Cargo or rustc.
r? @Mark-Simulacrum