Set redirects to false for httpclient used during nip05

[davotoula]

Change OkHttpClient used for NIP05 verification to not follow redirects.

I verified that this change fails NIP05 verifications with a redirect.

After reading the OkHttpClient docs I'm comfortable this will not create unnecessary resources.

Customize Your Client With newBuilder()
You can customize a shared OkHttpClient instance with newBuilder. This builds a client that shares the same connection pool, thread pools, and configuration. Use the builder methods to add configuration to the derived client for a specific purpose.

Fix for #915

[vitorpamplona]

Thank you @davotoula