Upgrade to Prometheus Client 1.3.10.

Comment From: breun

Will this upgrade also be backported to the 3.4.x and 3.5.x branches? Those branches currently use version 1.3.8, which doesn't correctly shade protobuf-java (https://github.com/prometheus/client_java/issues/1431), which was fixed in 1.3.9.

Comment From: snicoll

Yes