feat: use InstantPattern in Instant.__repr__

[chrisimcevoy]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 93.33333% with 1 line in your changes missing coverage. Please review.

Project coverage is 95.12%. Comparing base (84db8d0) to head (0a2236b).
Report is 39 commits behind head on main.

Files	Patch %	Lines
pyoda_time/time_zones/_zone_interval.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #139      +/-   ##
==========================================
+ Coverage   95.08%   95.12%   +0.03%     
==========================================
  Files         218      218              
  Lines       16871    16875       +4     
==========================================
+ Hits        16042    16052      +10     
+ Misses        829      823       -6     

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