bump staging plugin version to 0.22.0

The plugin often runs out of retries. In version 0.22.0 the default wait between retries has been increased to 5000 millis. Hopefully this mitigates the timeout issues

Signed-off-by: l-1squared <[email protected]>

build.gradle

@@ -1,7 +1,7 @@
 plugins {
     id 'com.github.kt3k.coveralls' version '2.8.4'
     id 'org.asciidoctor.jvm.convert' version '3.0.0'
-    id 'io.codearte.nexus-staging' version '0.21.1'
+    id 'io.codearte.nexus-staging' version '0.22.0'
     id 'com.github.ben-manes.versions' version '0.27.0'
     id 'org.sonarqube' version '2.8' apply false
     id 'com.github.node-gradle.node' version '2.2.4' apply false