Upgrade RSKj to latest stable release

site-cookbooks/kosmos_rsk/attributes/default.rb

@@ -1,2 +1,2 @@
-node.default['rskj']['version'] = '4.2.0~focal'
+node.default['rskj']['version'] = '4.4.0~focal'
 node.default['rskj']['network'] = 'testnet'

site-cookbooks/kosmos_rsk/test/integration/rskj/rskj_test.rb

@@ -9,7 +9,7 @@ end
 
 describe package('rskj') do
   it { should be_installed }
-  its('version') { should eq '4.2.0~focal' }
+  its('version') { should eq '4.4.0~focal' }
 end
 
 describe service('rsk') do