BATIK-1375. Disable releases for apache.snapshots repo

[adoroszlai]

What changes were proposed in this pull request?

Build tries to download release artifacts from Apache snapshots repo:

Downloading from apache.snapshots.https: https://repository.apache.org/content/repositories/snapshots/org/python/jython/2.7.0/jython-2.7.0.pom
Downloading from central: https://repo.maven.apache.org/maven2/org/python/jython/2.7.0/jython-2.7.0.pom
Downloaded from central: https://repo.maven.apache.org/maven2/org/python/jython/2.7.0/jython-2.7.0.pom (1.4 kB at 102 kB/s)

The Apache snapshot repository should be enabled only for snapshots.

enabled: true or false for whether this repository is enabled for the respective type (releases or snapshots). By default this is true. (source)

https://issues.apache.org/jira/browse/BATIK-1375

How was this patch tested?

Local build.

Repo list:

$ mvn -N --batch-mode eu.maveniverse.maven.plugins:toolbox:list-repositories
...
[INFO] --- toolbox:0.6.0:list-repositories (default-cli) @ batik ---
[INFO] Remote repositories used by project org.apache.xmlgraphics:batik:pom:1.18.0-SNAPSHOT.
[INFO]  * central (https://repo.maven.apache.org/maven2/, default, releases)
[INFO]    First introduced on root
[INFO]  * apache.snapshots.https (https://repository.apache.org/content/repositories/snapshots, default, snapshots)
[INFO]    First introduced on root

[adoroszlai]

Thanks @simonsteiner1984 for committing this as dba0121.