chore(deps): update rust crate axum to v0.8.8

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
axum	dependencies	patch	0.8.6 -> 0.8.8

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Release Notes

tokio-rs/axum (axum)

v0.8.8: axum v0.8.8

Compare Source

• Clarify documentation for Router::route_layer (#​3567)

v0.8.7: axum v0.8.7

Compare Source

• Relax implicit Send / Sync bounds on RouterAsService, RouterIntoService (#​3555)
• Make it easier to visually scan for default features (#​3550)
• Fix some documentation typos

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.25%. Comparing base (d7c89b0) to head (c14e43c).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #189   +/-   ##
=======================================
  Coverage   89.25%   89.25%           
=======================================
  Files           9        9           
  Lines         391      391           
=======================================
  Hits          349      349           
  Misses         42       42           

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