Update slf4j-version to v2.0.20

Author: xdev-renovate

src/chartjs-java-model/pom.xml

@@ -17,7 +17,7 @@
 	<description>chartjs-java-model</description>
 
 	<properties>
-		<slf4j-version>2.0.19</slf4j-version>
+		<slf4j-version>2.0.20</slf4j-version>
 
 		<log4j-version>2.26.1</log4j-version>