sj-version.sh: use public repository group

The group is a combined aggregator of all available public
repositories. In particular, it includes the Maven central and OSS
Sonatype repositories, where pom-scijava is now deployed.

With this change, versions of pom-scijava after 1.126 can be
successfully queried, too.

Author: ctrueden

sj-version.sh

@@ -9,7 +9,7 @@
 version="$1"
 diff="$2"
 
-repo="http://maven.imagej.net/content/repositories/releases"
+repo="http://maven.imagej.net/content/groups/public"
 
 props() {
 	url="$repo/org/scijava/pom-scijava/$1/pom-scijava-$1.pom"