[BWA-110] Retrofit ProGuard missing rule

[andrebispo5]

🎟️ Tracking

https://bitwarden.atlassian.net/browse/BWA-110

📔 Objective

Fix bug where Retrofit wasn't working properly with release configuration because the ProGuard rules were missing.

⏰ Reminders before review

• Contributor guidelines followed
• All formatters and local linters executed and passed
• Written new unit and / or integration tests where applicable
• Protected functional changes with optionality (feature flags)
• Used internationalization (i18n) for all UI strings
• CI builds passed
• Communicated to DevOps any deployment requirements
• Updated any necessary documentation (Confluence, contributing docs) or informed the documentation team

🦮 Reviewer guidelines

• 👍 (:+1:) or similar for great changes
• 📝 (:memo:) or ℹ️ (:information_source:) for notes or general info
• ❓ (:question:) for questions
• 🤔 (:thinking:) or 💭 (:thought_balloon:) for more open inquiry that's not quite a confirmed issue and could potentially benefit from discussion
• 🎨 (:art:) for suggestions / improvements
• ❌ (:x:) or ⚠️ (:warning:) for more significant problems or concerns needing attention
• 🌱 (:seedling:) or ♻️ (:recycle:) for future improvements or indications of technical debt
• ⛏ (:pick:) for minor or nitpick changes

[github-actions]

Checkmarx One – Scan Summary & Details – 3d2e2af3-49c7-4506-a580-6ed2aba2f805

No New Or Fixed Issues Found

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 41.28%. Comparing base (5e94b1b) to head (d8162f1).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #291      +/-   ##
==========================================
+ Coverage   41.21%   41.28%   +0.07%     
==========================================
  Files         118      118              
  Lines        5697     5697              
  Branches      679      679              
==========================================
+ Hits         2348     2352       +4     
+ Misses       3168     3163       -5     
- Partials      181      182       +1     

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