fix(nightly): Remove redundant track_caller which now causes errors on nightly

[teor2345]

Motivation

Nightly Rust errors on #[track_caller] on async functions, which used to be silently ignored.

This is part of the actual implementation of that feature:
rust-lang/rust#87417

Solution

Remove #[track_caller] in places where it causes an error on nightly Rust.

Review

This is a low priority cleanup.

Reviewer Checklist

• Will the PR name make sense to users?
  • Does it need extra CHANGELOG info? (new features, breaking changes, large changes)
• Are the PR labels correct?
• Does the code do what the ticket and PR says?
  • Does it change concurrent code, unsafe code, or consensus rules?
• How do you know it works? Does it have tests?

[codecov]

Codecov Report

Merging #5839 (dea3264) into main (f1e3fda) will decrease coverage by 0.01%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5839      +/-   ##
==========================================
- Coverage   78.70%   78.69%   -0.02%     
==========================================
  Files         308      308              
  Lines       38786    38786              
==========================================
- Hits        30528    30522       -6     
- Misses       8258     8264       +6