Bump okhttpVersion from 4.11.0 to 4.12.0

Bumps `okhttpVersion` from 4.11.0 to 4.12.0.

Updates `com.squareup.okhttp3:okhttp` from 4.11.0 to 4.12.0
- [Changelog](https://github.com/square/okhttp/blob/master/CHANGELOG.md)
- [Commits](square/okhttp@parent-4.11.0...parent-4.12.0)

Updates `com.squareup.okhttp3:logging-interceptor` from 4.11.0 to 4.12.0
- [Changelog](https://github.com/square/okhttp/blob/master/CHANGELOG.md)
- [Commits](square/okhttp@parent-4.11.0...parent-4.12.0)

Updates `com.squareup.okhttp3:mockwebserver` from 4.11.0 to 4.12.0
- [Changelog](https://github.com/square/okhttp/blob/master/CHANGELOG.md)
- [Commits](square/okhttp@parent-4.11.0...parent-4.12.0)

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

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

build.gradle

@@ -29,7 +29,7 @@ jgitver {
 }
 
 ext {
-  okhttpVersion = '4.11.0'
+  okhttpVersion = '4.12.0'
   jacksonVersion = '2.15.3'
   hamcrestVersion = '2.2'
 }