Update dependency com.diffplug.spotless:spotless-maven-plugin to v2.44.0.BETA4

Author: renovate[bot]

pom.xml

@@ -44,7 +44,7 @@
 	<properties>
 		<java.version>21</java.version>
 
-		<spotless.version>2.44.0.BETA2</spotless.version>
+		<spotless.version>2.44.0.BETA4</spotless.version>
 		<cleanthat.version>2.21</cleanthat.version>
 
 		<!-- By default (i.e. in local environments), check for code formatting AFTER trying automatic fixes. -->