Chore: Remove Retrofit dependency from app module

[david-livefront]

🎟️ Tracking

N/A

📔 Objective

This PR updates the 2 spots in the app module that still reference the Retrofit library and allows us to remove that dependency from the app module completely.

[codecov]

Codecov Report

❌ Patch coverage is 82.14286% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.93%. Comparing base (b11884c) to head (727cf0e).

Files with missing lines	Patch %	Lines
.../bitwarden/data/vault/manager/CipherManagerImpl.kt	85.71%	1 Missing ⚠️
...it/bitwarden/data/vault/manager/SendManagerImpl.kt	85.71%	1 Missing ⚠️
...om/bitwarden/network/service/CiphersServiceImpl.kt	83.33%	0 Missing and 1 partial ⚠️
.../com/bitwarden/network/service/SendsServiceImpl.kt	83.33%	0 Missing and 1 partial ⚠️
.../com/bitwarden/network/util/ExceptionExtensions.kt	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6896      +/-   ##
==========================================
- Coverage   86.14%   85.93%   -0.22%     
==========================================
  Files         894      853      -41     
  Lines       62486    60997    -1489     
  Branches     8937     8904      -33     
==========================================
- Hits        53830    52419    -1411     
+ Misses       5589     5525      -64     
+ Partials     3067     3053      -14     

Flag	Coverage Δ
app-data	17.50% <42.85%> (+0.31%)	⬆️
app-ui-auth-tools	19.78% <0.00%> (-0.23%)	⬇️
app-ui-platform	15.63% <0.00%> (-0.42%)	⬇️
app-ui-vault	26.60% <0.00%> (-0.68%)	⬇️
authenticator	6.45% <0.00%> (-0.01%)	⬇️
lib-core-network-bridge	4.16% <39.28%> (+0.01%)	⬆️
lib-data-ui	1.15% <0.00%> (-0.01%)	⬇️

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