Use Java 17.

pom.xml

@@ -8,19 +8,19 @@
 	<packaging>jar</packaging>
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-		<maven.compiler.source>11</maven.compiler.source>
-		<maven.compiler.target>11</maven.compiler.target>
+		<maven.compiler.source>17</maven.compiler.source>
+		<maven.compiler.target>17</maven.compiler.target>
 	</properties>
 	<dependencies>
 		<dependency>
 			<groupId>org.openjfx</groupId>
 			<artifactId>javafx-controls</artifactId>
-			<version>11</version>
+			<version>17.0.2</version>
 		</dependency>
 		<dependency>
 			<groupId>org.openjfx</groupId>
 			<artifactId>javafx-fxml</artifactId>
-			<version>11</version>
+			<version>17.0.2</version>
 		</dependency>
 		<!-- https://mvnrepository.com/artifact/org.junit.jupiter/junit-jupiter-api -->
 		<dependency>