Update parent to pom-scijava-base 20.0.0

The breaking changes are removal of the therapi configuration,
javafx-maven-plugin configuration, and corresponding dist profile.

pom.xml

@@ -6,12 +6,12 @@
 	<parent>
 		<groupId>org.scijava</groupId>
 		<artifactId>pom-scijava-base</artifactId>
-		<version>19.0.0</version>
+		<version>20.0.0</version>
 		<relativePath />
 	</parent>
 
 	<artifactId>pom-scijava</artifactId>
-	<version>39.1.0-SNAPSHOT</version>
+	<version>40.0.0-SNAPSHOT</version>
 	<packaging>pom</packaging>
 
 	<name>SciJava Parent POM</name>