Last human commit was 4 days ago and the last release was last month. I think it’s still active.
Edit: Wow I linked to the wrong repository. My bad. Github was experiencing an outage so I pulled the link from google. Here is the real repo: https://github.com/lysine-dev/okhttp
Edit 2: Github is still struggling but will try to get you the exact location in code once I can load the page.
Edit 3: Here is the updated location in code: https://github.com/lysine-dev/okhttp/blob/main/okhttp/src/commonJvmAndroid/kotlin/okhttp3/internal/url/-Url.kt#L30.
You can open a ticket there and explain the issue. They are still closing issues so they should be able to get to it.
Edit 4: Github is dead again :/