POM: declare classgraph version as a property

Author: ctrueden

pom.xml

@@ -99,6 +99,8 @@ Institute of Molecular Cell Biology and Genetics.</license.copyrightOwners>
 
 		<!-- NB: Deploy releases to the SciJava Maven repository. -->
 		<releaseProfiles>sign,deploy-to-scijava</releaseProfiles>
+
+		<classgraph.version>4.8.172</classgraph.version>
 	</properties>
 
 	<dependencies>
@@ -111,11 +113,14 @@ Institute of Molecular Cell Biology and Genetics.</license.copyrightOwners>
 			<groupId>org.scijava</groupId>
 			<artifactId>scijava-common</artifactId>
 		</dependency>
+
+		<!-- Third party dependencies -->
 		<dependency>
 			<groupId>io.github.classgraph</groupId>
 			<artifactId>classgraph</artifactId>
-			<version>4.8.172</version>
+			<version>${classgraph.version}</version>
 		</dependency>
+
 		<!-- Test dependencies -->
 		<dependency>
 			<groupId>junit</groupId>