Update the pom's Java version to match the github build.

Author: shawjef3

pom.xml

@@ -51,16 +51,47 @@
 
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <maven.compiler.source>1.8</maven.compiler.source>
-        <maven.compiler.target>1.8</maven.compiler.target>
+        <maven.compiler.release>21</maven.compiler.release>
     </properties>
 
     <build>
         <pluginManagement>
             <plugins>
+                <plugin>
+                    <groupId>org.apache.maven.plugins</groupId>
+                    <artifactId>maven-compiler-plugin</artifactId>
+                    <version>3.15.0</version>
+                    <configuration>
+                        <release>${maven.compiler.release}</release>
+                    </configuration>
+                </plugin>
                 <plugin>
                     <artifactId>maven-surefire-plugin</artifactId>
-                    <version>2.22.2</version>
+                    <version>3.5.5</version>
+                </plugin>
+                <plugin>
+                    <groupId>org.apache.maven.plugins</groupId>
+                    <artifactId>maven-enforcer-plugin</artifactId>
+                    <version>3.6.2</version>
+                    <executions>
+                        <execution>
+                            <id>enforce-java-and-maven</id>
+                            <phase>validate</phase>
+                            <goals>
+                                <goal>enforce</goal>
+                            </goals>
+                            <configuration>
+                                <rules>
+                                    <requireJavaVersion>
+                                        <version>[21,)</version>
+                                    </requireJavaVersion>
+                                    <requireMavenVersion>
+                                        <version>[3.9.0,)</version>
+                                    </requireMavenVersion>
+                                </rules>
+                            </configuration>
+                        </execution>
+                    </executions>
                 </plugin>
                 <plugin>
                     <groupId>org.jacoco</groupId>
@@ -84,7 +115,7 @@
                 <plugin>
                     <groupId>com.diffplug.spotless</groupId>
                     <artifactId>spotless-maven-plugin</artifactId>
-                    <version>3.2.1</version>
+                    <version>3.4.0</version>
                     <configuration>
                         <java>
                             <googleJavaFormat>
@@ -105,7 +136,7 @@
                 <plugin>
                     <groupId>org.apache.maven.plugins</groupId>
                     <artifactId>maven-source-plugin</artifactId>
-                    <version>3.2.0</version>
+                    <version>3.4.0</version>
                     <executions>
                         <execution>
                             <id>attach-sources</id>
@@ -119,7 +150,7 @@
                 <plugin>
                     <groupId>org.apache.maven.plugins</groupId>
                     <artifactId>maven-javadoc-plugin</artifactId>
-                    <version>3.3.1</version>
+                    <version>3.12.0</version>
                     <configuration>
                         <show>public</show>
                     </configuration>
@@ -136,7 +167,7 @@
                 <plugin>
                     <groupId>org.apache.maven.plugins</groupId>
                     <artifactId>maven-gpg-plugin</artifactId>
-                    <version>1.5</version>
+                    <version>3.2.8</version>
                     <executions>
                         <execution>
                             <id>sign-artifacts</id>
@@ -149,6 +180,16 @@
                 </plugin>
             </plugins>
         </pluginManagement>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-enforcer-plugin</artifactId>
+            </plugin>
+        </plugins>
     </build>
 
     <profiles>