feat(shorebird_code_push_client): add update release support

[bryanoltman]

Description

Add support for sending PATCH requests to api/v1/releases/:id. This will be used to update release status.

Part of #774

Type of Change

• ✨ New feature (non-breaking change which adds functionality)
• 🛠️ Bug fix (non-breaking change which fixes an issue)
• ❌ Breaking change (fix or feature that would cause existing functionality to change)
• 🧹 Code refactor
• ✅ Build configuration change
• 📝 Documentation
• 🗑️ Chore

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (198349c) 100.00% compared to head (7e01fa9) 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##              main      #851    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files          145        78    -67     
  Lines         3503      2936   -567     
==========================================
- Hits          3503      2936   -567     

Impacted Files	Coverage Δ
...ird_code_push_client/lib/src/code_push_client.dart	100.00% <100.00%> (ø)

... and 67 files with indirect coverage changes

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