BAEL-5246: pom cleanup (#4620)

* BAEL-5246: round 1 of pom cleanup - upto "jersey" project

* BAEL-5246: Initial pass for pom cleanup - upto spring-cloud

* BAEL-5246: pom cleanup upto testing-modules/junit5

* BAEL-5246: pom cleanup - upto xstream

* BAEL-5246: pom cleanup - last round (before review)

spring-boot/pom.xml

@@ -65,12 +65,12 @@
         <dependency>
             <groupId>com.graphql-java</groupId>
             <artifactId>graphql-spring-boot-starter</artifactId>
-            <version>3.6.0</version>
+            <version>${graphql-spring-boot-starter.version}</version>
         </dependency>
         <dependency>
             <groupId>com.graphql-java</groupId>
             <artifactId>graphql-java-tools</artifactId>
-            <version>3.2.0</version>
+            <version>${graphql-java-tools.version}</version>
         </dependency>
 
         <dependency>
@@ -107,7 +107,7 @@
         <dependency>
             <groupId>com.google.guava</groupId>
             <artifactId>guava</artifactId>
-            <version>18.0</version>
+            <version>${guava.version}</version>
         </dependency>
 
         <dependency>
@@ -213,13 +213,15 @@
         </profile>
     </profiles>
 
-
     <properties>
         <!-- The main class to start by executing java -jar -->
         <start-class>org.baeldung.demo.DemoApplication</start-class>
         <tomee-servlet-api.version>8.5.11</tomee-servlet-api.version>
         <togglz.version>2.4.1.Final</togglz.version>
         <rome.version>1.9.0</rome.version>
+        <graphql-spring-boot-starter.version>3.6.0</graphql-spring-boot-starter.version>
+        <graphql-java-tools.version>3.2.0</graphql-java-tools.version>
+        <guava.version>18.0</guava.version>
     </properties>
 
 </project>