[READY] Update ycmd submodule

[bstaletic]

PR Prelude

Thank you for working on YCM! :)

Please complete these steps and check these boxes (by putting an x inside
the brackets) before filing your PR:

• I have read and understood YCM's CONTRIBUTING document.
• I have read and understood YCM's CODE_OF_CONDUCT document.
• I have included tests for the changes in my PR. If not, I have included a
  rationale for why I haven't.
• I understand my PR may be closed if it becomes obvious I didn't
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Why this change is necessary and useful

[Please explain in detail why the changes in this PR are needed.]

Mostly a bugfix update:

• Upgrade tsserver to 4.3.5 and fix the path issue on Windows
• Upgrade rust-analyzer to nightly-2021-07-29 and make sure proc macros
  work

---

This change is 

[codecov]

Codecov Report

Merging #3928 (d0bf908) into master (8c6081c) will increase coverage by 0.13%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3928      +/-   ##
==========================================
+ Coverage   91.76%   91.90%   +0.13%     
==========================================
  Files          27       27              
  Lines        3668     3668              
==========================================
+ Hits         3366     3371       +5     
+ Misses        302      297       -5     

[puremourning]

Thanks.

Reviewed 1 of 1 files at r1, all commit messages.
Reviewable status: 1 of 2 LGTMs obtained (waiting on @bstaletic)

[mergify]

Thanks for sending a PR!