Update Rust crate axum to v0.7.7

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
axum	dependencies	patch	=0.7.6 -> =0.7.7

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Release Notes

tokio-rs/axum (axum)

v0.7.7: axum v0.7.7

Compare Source

• change: Remove manual tables of content from the documentation, since
  rustdoc now generates tables of content in the sidebar (#​2921)

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Configuration

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.05%. Comparing base (a9696b8) to head (9971f3a).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9534      +/-   ##
==========================================
- Coverage   89.05%   89.05%   -0.01%     
==========================================
  Files         285      285              
  Lines       28757    28757              
==========================================
- Hits        25610    25609       -1     
- Misses       3147     3148       +1     

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