bump SLF4J version to 2.0.15

Signed-off-by: Ceki Gulcu <[email protected]>

Author: ceki

pom.xml

@@ -74,7 +74,7 @@
     <!-- slf4j.version property is used below, in
          logback-classic/pom.xml, /logback-examples/src/main/resources/setClasspath.cmd, download.html
     -->    
-    <slf4j.version>2.1.0-alpha2-SNAPSHOT</slf4j.version>
+    <slf4j.version>2.0.15</slf4j.version>
     <cal10n.version>0.8.1</cal10n.version>
     <consolePlugin.version>1.1.0</consolePlugin.version>
     <tomcat.version>10.0.10</tomcat.version>