Bump okhttpVersion from 5.1.0 to 5.2.1

Bumps `okhttpVersion` from 5.1.0 to 5.2.1.

Updates `com.squareup.okhttp3:okhttp-tls` from 5.1.0 to 5.2.1
- [Changelog](https://github.com/square/okhttp/blob/master/CHANGELOG.md)
- [Commits](square/okhttp@parent-5.1.0...parent-5.2.1)

Updates `com.squareup.okhttp3:mockwebserver` from 5.1.0 to 5.2.1
- [Changelog](https://github.com/square/okhttp/blob/master/CHANGELOG.md)
- [Commits](square/okhttp@parent-5.1.0...parent-5.2.1)

---
updated-dependencies:
- dependency-name: com.squareup.okhttp3:okhttp-tls
  dependency-version: 5.2.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: com.squareup.okhttp3:mockwebserver
  dependency-version: 5.2.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

build.gradle

@@ -7,7 +7,7 @@ plugins {
 }
 
 ext {
-    okhttpVersion = '5.1.0'
+    okhttpVersion = '5.2.1'
 }
 
 dependencies {