feat: add update rrset records action to zone client

[jooola]

• https://docs.hetzner.cloud/reference/cloud#zone-rrset-actions-update-records-of-an-rrset

[codecov]

Codecov Report

❌ Patch coverage is 90.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 96.65%. Comparing base (f2d4bcb) to head (dfb6cc1).

Files with missing lines	Patch %	Lines
hcloud/zones/client.py	90.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #597      +/-   ##
==========================================
- Coverage   96.67%   96.65%   -0.02%     
==========================================
  Files          68       68              
  Lines        3426     3436      +10     
==========================================
+ Hits         3312     3321       +9     
- Misses        114      115       +1     

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