use HTTPS url for imagej maven repository

Author: axtimwalde

pom.xml

@@ -194,7 +194,7 @@ Jean-Yves Tinevez and Michael Zinsmaier.</license.copyrightOwners>
 		<!-- NB: for SciJava dependencies -->
 		<repository>
 			<id>imagej.public</id>
-			<url>http://maven.imagej.net/content/groups/public</url>
+			<url>https://maven.imagej.net/content/groups/public</url>
 		</repository>
 	</repositories>