Version 3 requires Java 11

[mrts]

Using a newer LTS version of Java enables us to use the built-in HttpClient and discard the OkHttpClient dependency as requested in #31.

Version 3 was released on August 7, 2023. As originally announced, we guarantee Java 8 compatible maintenance releases of version 2 until September 2023 and beyond if necessary.

If you need Java 8 support after September 2023, please request it in issue comments below.

[mrts]

This is coming in the near future when #43 is merged.