Update Wicket to 7.6.0 (#2599)

Update dependencies:
- HikariCP -> 2.6.0
- SLF4J -> 1.7.25
- Jackson -> 2.8.7

frameworks/Java/wicket/pom.xml

@@ -20,8 +20,8 @@
 	</licenses>
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-		<wicket.version>7.5.0</wicket.version>
-		<slf4j.version>1.7.21</slf4j.version>
+		<wicket.version>7.6.0</wicket.version>
+		<slf4j.version>1.7.25</slf4j.version>
 	</properties>
 	<dependencies>
 		<!-- WICKET DEPENDENCIES -->
@@ -35,7 +35,7 @@
 		<dependency>
 			<groupId>com.zaxxer</groupId>
 			<artifactId>HikariCP</artifactId>
-			<version>2.5.1</version>
+			<version>2.6.0</version>
 			<scope>compile</scope>
 		</dependency>
 
@@ -62,13 +62,13 @@
 		<dependency>
 			<groupId>com.fasterxml.jackson.module</groupId>
 			<artifactId>jackson-module-afterburner</artifactId>
-			<version>2.8.5</version>
+			<version>2.8.7</version>
 		</dependency>
 
 		<dependency>
 			<groupId>com.fasterxml.jackson.core</groupId>
 			<artifactId>jackson-annotations</artifactId>
-			<version>2.8.5</version>
+			<version>2.8.7</version>
 		</dependency>
 
 		<dependency>