Update RLS and Rustfmt (and Cargo)

[nrc]

Updates RLS and Rustfmt (the latter fixing tests). Cargo is updated too (to fix RLS tests), but that is covered by #50417, so probably won't do much.

r? @alexcrichton

[rust-highfive]

Warning

• These commits modify submodules.

[alexcrichton]

@bors: r+ p=1

[bors]

📌 Commit 97c30ce has been approved by alexcrichton

[kennytm]

@bors p=4

[bors]

🔒 Merge conflict

[bors]

☔ The latest upstream changes (presumably #50413) made this pull request unmergeable. Please resolve the merge conflicts.

[nrc]

@bors r=alexcrichton p=4

[bors]

📌 Commit 4952426 has been approved by alexcrichton

[bors]

⌛ Testing commit 4952426 with merge 841e0cc...

[bors]

☀️ Test successful - status-appveyor, status-travis
Approved by: alexcrichton
Pushing 841e0cc to master...

[kennytm]

rustfmt is still test-fail, same error as before.

[01:19:34] failures:
[01:19:34] 
[01:19:34] ---- test::verify_check_works stdout ----
[01:19:34] 	thread 'test::verify_check_works' panicked at 'No such file or directory (os error 2)', /cargo/registry/src/github.com-1ecc6299db9ec823/assert_cli-0.5.4/src/assert.rs:368:13
[01:19:34] note: Run with `RUST_BACKTRACE=1` for a backtrace.
[01:19:34] 
[01:19:34] ---- test::verify_diff_works stdout ----
[01:19:34] 	thread 'test::verify_diff_works' panicked at 'No such file or directory (os error 2)', /cargo/registry/src/github.com-1ecc6299db9ec823/assert_cli-0.5.4/src/assert.rs:368:13
[01:19:34] 
[01:19:34] 
[01:19:34] failures:
[01:19:34]     test::verify_check_works
[01:19:34]     test::verify_diff_works