The issue is that SceneBuilder is saving FXML files using version 20.0.1, but your project is only installing version 20.0 from the maven repositories.
However, good news! It turns out you can get JavaFX version 20.0.01 from the maven repositories. You just need to edit your pom.xml to update the dependencies for JavaFX to 20.0.1, like this:
<dependencies>
<dependency>
<groupId>org.openjfx</groupId>
<artifactId>javafx-controls</artifactId>
<version>20.0.1</version>
</dependency>
<dependency>
<groupId>org.openjfx</groupId>
<artifactId>javafx-fxml</artifactId>
<version>20.0.1</version>
</dependency>
</dependencies>