Upgrade to JMustache 1.15

wilkinsona · wilkinsona · commit 108e04bc875a · 2022-07-18T17:33:48.000+01:00
Closes gh-834
diff --git a/gradle.properties b/gradle.properties
@@ -5,4 +5,4 @@ org.gradle.jvmargs=-Xmx2g -Dfile.encoding=UTF-8
 org.gradle.parallel=true
 
 javaFormatVersion=0.0.34
-jmustacheVersion=1.12
+jmustacheVersion=1.15
