fix: replace deprecated slf4j-log4j12 with slf4j-reload4j

Maven warning:
  'The artifact org.slf4j:slf4j-log4j12:jar:1.7.36 has been relocated
   to org.slf4j:slf4j-reload4j:jar:1.7.36'

slf4j-log4j12 was replaced by slf4j-reload4j due to log4j vulnerabilities.
The reload4j project is a fork of log4j 1.2.17 with security fixes.

This is a drop-in replacement with the same API.

test/java/spark/pom.xml

@@ -235,7 +235,7 @@
 
         <dependency>
             <groupId>org.slf4j</groupId>
-            <artifactId>slf4j-log4j12</artifactId>
+            <artifactId>slf4j-reload4j</artifactId>
             <version>1.7.36</version>
             <scope>test</scope>
         </dependency>