GH-279 - Improve annotation processor setup.

Temporarily extract version numbers into properties until the compiler plugin considers the versions declared in dependency management [0].

[0] https://issues.apache.org/jira/browse/MCOMPILER-391

pom.xml

@@ -37,6 +37,7 @@
 		<artifactory-maven-plugin.version>3.5.1</artifactory-maven-plugin.version>
 		<flapdoodle-mongodb.version>4.6.1</flapdoodle-mongodb.version>
 		<jmolecules-bom.version>2023.1.0</jmolecules-bom.version>
+		<lombok.version>1.18.28</lombok.version>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
 		<spring.version>6.0.11</spring.version> <!-- For Javadoc links only -->
@@ -492,7 +493,7 @@ limitations under the License.
 						<path>
 							<groupId>org.projectlombok</groupId>
 							<artifactId>lombok</artifactId>
-							<version>1.18.28</version>
+							<version>${lombok.version}</version>
 						</path>
 					</annotationProcessorPaths>
 				</configuration>

spring-modulith-examples/pom.xml

@@ -23,6 +23,7 @@
 
 	<properties>
 		<java.version>17</java.version>
+		<spring-boot.version>3.1.2</spring-boot.version>
 	</properties>
 
 	<build>
@@ -38,12 +39,12 @@
 						<path>
 							<groupId>org.springframework.boot</groupId>
 							<artifactId>spring-boot-configuration-processor</artifactId>
-							<version>3.1.2</version>
+							<version>${spring-boot.version}</version>
 						</path>
 						<path>
 							<groupId>org.projectlombok</groupId>
 							<artifactId>lombok</artifactId>
-							<version>1.18.28</version>
+							<version>${lombok.version}</version>
 						</path>
 					</annotationProcessorPaths>
 				</configuration>