Merge pull request #6 from jecklgamis/next

Add enforcer plugin, upgrade dependencies

pom.xml

@@ -77,7 +77,7 @@
         <dependency>
             <groupId>com.google.guava</groupId>
             <artifactId>guava</artifactId>
-            <version>33.0.0-jre</version>
+            <version>33.1.0-jre</version>
         </dependency>
     </dependencies>
 
@@ -112,6 +112,26 @@
                     </execution>
                 </executions>
             </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-enforcer-plugin</artifactId>
+                <version>3.4.1</version>
+                <executions>
+                    <execution>
+                        <id>enforce-java</id>
+                        <goals>
+                            <goal>enforce</goal>
+                        </goals>
+                        <configuration>
+                            <rules>
+                                <requireJavaVersion>
+                                    <version>21</version>
+                                </requireJavaVersion>
+                            </rules>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
         </plugins>
     </build>
 </project>