Build: Do not cache snapshots

Gradle marks dependencies with a version containing "SNAPSHOT" as
"changing", and caches them for 24 hours by default. This updates the
configuration to not cache them at all.

Original commit: elastic/x-pack-elasticsearch@ac95e30a96

build.gradle

@@ -8,6 +8,10 @@ allprojects {
 subprojects {
   group = 'org.elasticsearch'
   version = org.elasticsearch.gradle.VersionProperties.elasticsearch
+
+  configurations.all {
+    resolutionStrategy.cacheChangingModulesFor(0, 'seconds')
+  }
 }
 
 if (hasProperty('projectsPrefix') == false) {