remove the unused grpc health library that is hosted in bintray which got decommissioned

Makefile

@@ -10,6 +10,7 @@ conductor: conductor-config log4j-config conductor-service
 	tar xf mender-v2.2.0-1.tar.gz
 	patch -Np1 -d conductor-mender-v2.2.0-1 < conductor-mender-v2.2.0-1-system_protoc.patch
 	patch -Np1 -d conductor-mender-v2.2.0-1 < conductor-mender-v2.2.0-1-temporary_protoc-gen-grpc-java.patch
+	patch -Np1 -d conductor-mender-v2.2.0-1 < conductor-mender-v2.2.0-1-no-grpc-healthcheck.patch
 
 	dd if=/dev/zero of=swap bs=1048576 count=1024
 	chmod 600 swap

conductor-mender-v2.2.0-1-no-grpc-healthcheck.patch

+diff -uNr conductor-mender-v2.2.0-1/grpc/build.gradle conductor-mender-v2.2.0-1-no-grpc-healthcheck/grpc/build.gradle
+--- conductor-mender-v2.2.0-1/grpc/build.gradle	2019-03-04 21:50:40.000000000 +1030
++++ conductor-mender-v2.2.0-1-no-grpc-healthcheck/grpc/build.gradle	2021-06-09 21:18:22.720662545 +0930
+@@ -10,15 +10,10 @@
+     id "com.google.protobuf" version "0.8.5"
+ }
+ 
+-repositories{
+-    maven { url "https://dl.bintray.com/chaos-systems/mvn" }
+-}
+-
+ dependencies {
+     compile project(':conductor-common')
+     compile project(':conductor-core')
+ 
+-    protobuf 'io.chaossystems.grpc:grpc-healthcheck:1.0.+:protos'
+     compile "com.google.api.grpc:proto-google-common-protos:1.0.0"
+     compile "io.grpc:grpc-protobuf:${revGrpc}"
+     compile "io.grpc:grpc-stub:${revGrpc}"