Require eXist 5.4.0

Author: joewiz

pom.xml

@@ -48,7 +48,7 @@
     <project.build.source>1.8</project.build.source>
     <project.build.target>1.8</project.build.target>
 
-    <exist.version>5.3.1-SNAPSHOT</exist.version>
+    <exist.version>5.4.0</exist.version>
     <templating.version>1.0.2</templating.version>
     <node.version>v14.17.6</node.version>
     <npm.version>7.24.0</npm.version>