Bump com.squareup.okhttp3:okhttp from 4.9.3 to 4.12.0

Bumps [com.squareup.okhttp3:okhttp](https://github.com/square/okhttp) from 4.9.3 to 4.12.0.
- [Changelog](https://github.com/square/okhttp/blob/master/CHANGELOG.md)
- [Commits](square/okhttp@parent-4.9.3...parent-4.12.0)

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

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

build.gradle

@@ -56,7 +56,7 @@ dependencies {
     implementation "com.github.komputing.kethereum:rpc_min3:${KETHEREUM_VERSION}"
     implementation "com.github.komputing.kethereum:crypto_impl_bouncycastle:${KETHEREUM_VERSION}"
 
-    implementation "com.squareup.okhttp3:okhttp:4.9.3"
+    implementation "com.squareup.okhttp3:okhttp:4.12.0"
 
     implementation 'com.beust:klaxon:5.6'
     implementation 'com.squareup.moshi:moshi-kotlin:1.13.0'