Update RLS to release version #55966
Description
Potentially blocking issues are at https://github.com/rust-lang-nursery/rls/issues?q=is%3Aopen+is%3Aissue+milestone%3A%22Edition+RC1%22, they need triaging though
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Potentially blocking issues are at https://github.com/rust-lang-nursery/rls/issues?q=is%3Aopen+is%3Aissue+milestone%3A%22Edition+RC1%22, they need triaging though