Bump retrofitVersion from 2.11.0 to 3.0.0 (#49)

Bumps `retrofitVersion` from 2.11.0 to 3.0.0.

Updates `com.squareup.retrofit2:retrofit` from 2.11.0 to 3.0.0
- [Release notes](https://github.com/square/retrofit/releases)
- [Changelog](https://github.com/square/retrofit/blob/trunk/CHANGELOG.md)
- [Commits](square/retrofit@2.11.0...3.0.0)

Updates `com.squareup.retrofit2:converter-gson` from 2.11.0 to 3.0.0
- [Release notes](https://github.com/square/retrofit/releases)
- [Changelog](https://github.com/square/retrofit/blob/trunk/CHANGELOG.md)
- [Commits](square/retrofit@2.11.0...3.0.0)

---
updated-dependencies:
- dependency-name: com.squareup.retrofit2:retrofit
  dependency-version: 3.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: com.squareup.retrofit2:converter-gson
  dependency-version: 3.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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Author: dependabot[bot]

build.gradle

@@ -4,7 +4,7 @@ buildscript {
     ext.okhttpVersion = '4.12.0'
     ext.gsonVersion = '2.13.1'
     ext.jjwtVersion = 'd6feebe558'
-    ext.retrofitVersion = '2.11.0'
+    ext.retrofitVersion = '3.0.0'
     ext.coroutineAdapterVersion = '0.9.2'
     ext.coroutinesVersion = '1.10.2'
     ext.bouncycastleVersion = '1.70'