build: pin down target Java version using more comprehensible property

Author: poikilotherm

pom.xml

@@ -27,8 +27,8 @@
 
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    <maven.compiler.source>17</maven.compiler.source>
-    <maven.compiler.target>17</maven.compiler.target>
+    <jdk.version>${jdk.version}</jdk.version>
+    
     <!-- Official Maven Plugins -->
     <maven-plugin-api.version>3.8.2</maven-plugin-api.version>
     <maven-plugin-annotations.version>3.6.4</maven-plugin-annotations.version>
@@ -168,7 +168,7 @@
       <plugin>
         <artifactId>maven-compiler-plugin</artifactId>
         <configuration>
-          <release>17</release>
+          <release>${jdk.version}</release>
         </configuration>
       </plugin>
       <plugin>
@@ -228,7 +228,7 @@
             <groupId>org.apache.maven.plugins</groupId>
             <artifactId>maven-javadoc-plugin</artifactId>
             <configuration>
-              <source>17</source>
+              <source>${jdk.version}</source>
               <detectJavaApiLink>false</detectJavaApiLink>
             </configuration>
             <executions>