fix(http): use route name from 'r.Pattern' instead

[aldy505]

I have a Go project running latest Chi - v5.1.0 and Go 1.22.x. Every root span becomes: GET /*/*/*. I don't think this is an issue on Chi though. Hoping this would fix that.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 82.90%. Comparing base (e5d46d5) to head (f4e8894). Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #875      +/-   ##
==========================================
- Coverage   82.94%   82.90%   -0.05%     
==========================================
  Files          53       55       +2     
  Lines        4592     4603      +11     
==========================================
+ Hits         3809     3816       +7     
- Misses        630      633       +3     
- Partials      153      154       +1     

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[aldy505]

So http.Request.Pattern only exists on Go 1.23, yet the route matching exists on Go 1.22 :/

[ribice]

Looks good to me. Please update changelog as well.