JAVA-7661: Upgrade logback to 1.2.6 (#11325)

* JAVA-7661: Upgrade logback version to 1.2.6 in the main pom.xml

* JAVA-7661: Use logback.version property from the main pom.xml

* JAVA-7661: Fix maven-exec-plugin setup

kubernetes/k8s-intro/pom.xml

@@ -20,7 +20,7 @@
         <dependency>
             <groupId>ch.qos.logback</groupId>
             <artifactId>logback-classic</artifactId>
-            <version>1.2.3</version>
+            <version>${logback.version}</version>
         </dependency>
     </dependencies>
 

maven-modules/maven-exec-plugin/pom.xml

@@ -12,7 +12,7 @@
         <dependency>
             <groupId>ch.qos.logback</groupId>
             <artifactId>logback-classic</artifactId>
-            <version>${logback-classic.version}</version>
+            <version>${logback.version}</version>
         </dependency>
     </dependencies>
 
@@ -44,9 +44,9 @@
     </build>
 
     <properties>
+        <logback.version>1.2.6</logback.version>
         <maven-compiler-plugin.version>3.8.1</maven-compiler-plugin.version>
         <java.version>1.8</java.version>
-        <logback-classic.version>1.2.3</logback-classic.version>
     </properties>
 
 </project>

pom.xml

@@ -1393,7 +1393,7 @@
 
         <!-- logging -->
         <org.slf4j.version>1.7.30</org.slf4j.version>
-        <logback.version>1.2.3</logback.version>
+        <logback.version>1.2.6</logback.version>
 
         <!-- plugins -->
         <!-- can't upgrade the plugin yet; as there is an issue with 2.22 no longer running all the tests-->