Update parent to pom-scijava-base 8.1.0

Hoping this fixes a problem with double deployment of -sources
artifacts, so that we can reliably release components again.

Author: ctrueden

pom.xml

@@ -5,7 +5,7 @@
 	<parent>
 		<groupId>org.scijava</groupId>
 		<artifactId>pom-scijava-base</artifactId>
-		<version>8.0.0</version>
+		<version>8.1.0</version>
 		<relativePath />
 	</parent>