Bump okhttp from 4.9.0 to 4.9.3 (#363)

Bumps [okhttp](https://github.com/square/okhttp) from 4.9.0 to 4.9.3.
- [Release notes](https://github.com/square/okhttp/releases)
- [Changelog](https://github.com/square/okhttp/blob/master/CHANGELOG.md)
- [Commits](https://github.com/square/okhttp/compare/parent-4.9.0...parent-4.9.3)

---
updated-dependencies:
- dependency-name: com.squareup.okhttp3:okhttp
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

buildsystem/dependencies.gradle

@@ -34,7 +34,7 @@ ext.versions = [
         lifecycle                   : '2.2.0',
         material                    : '1.4.0',
         navigation                  : '2.3.5',
-        okHttp                      : '4.9.0',
+        okHttp                      : '4.9.3',
         okio                        : '3.0.0',
         recyclerView                : '1.2.1',
         retrofit                    : '2.9.0',