Bump jetty-maven-plugin from 9.4.38.v20210224 to 9.4.40.v20210413

Bumps [jetty-maven-plugin](https://github.com/eclipse/jetty.project) from 9.4.38.v20210224 to 9.4.40.v20210413.
- [Release notes](https://github.com/eclipse/jetty.project/releases)
- [Commits](jetty/jetty.project@jetty-9.4.38.v20210224...jetty-9.4.40.v20210413)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

vaadin-maps-leaflet-flow-demo/pom.xml

@@ -81,7 +81,7 @@
 			<plugin>
 				<groupId>org.eclipse.jetty</groupId>
 				<artifactId>jetty-maven-plugin</artifactId>
-				<version>9.4.38.v20210224</version>
+				<version>9.4.40.v20210413</version>
 				<configuration>
 					<scanIntervalSeconds>1</scanIntervalSeconds>
 				</configuration>