build: Bump Rust toolchain to nightly-2024-08-26

[stinodego]

The new toolchain includes two new lints:

• A lint for using if let instead of a match statement in certain cases.
• A lint for splitting a docstring summary from the rest of the docstring (similar to what we have in Python).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.81%. Comparing base (aa283e6) to head (5fb0890).
Report is 71 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #18370      +/-   ##
==========================================
- Coverage   79.83%   79.81%   -0.03%     
==========================================
  Files        1496     1496              
  Lines      200333   200333              
  Branches     2841     2841              
==========================================
- Hits       159944   159903      -41     
- Misses      39864    39905      +41     
  Partials      525      525              

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[codspeed-hq]

CodSpeed Performance Report

Merging #18370 will improve performances by 28.06%

_{Comparing rustc-update (5fb0890) with main (aa283e6)}

Summary

⚡ 1 improvements
✅ 36 untouched benchmarks

Benchmarks breakdown

	Benchmark	main	rustc-update	Change
⚡	test_groupby_h2oai_q4	2.6 ms	2 ms	+28.06%