OPENNLP-1670: Disable releases for apache.snapshots repo

[adoroszlai]

What changes were proposed in this pull request?

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)

$ mvn -N --batch-mode eu.maveniverse.maven.plugins:toolbox:list-repositories
[INFO] Scanning for projects...
[INFO] 
[INFO] ---------------------< org.apache.opennlp:opennlp >---------------------
[INFO] Building Apache OpenNLP Reactor 2.5.2-SNAPSHOT
[INFO]   from pom.xml
[INFO] --------------------------------[ pom ]---------------------------------
[INFO] 
[INFO] --- toolbox:0.6.0:list-repositories (default-cli) @ opennlp ---
[INFO] Remote repositories used by project org.apache.opennlp:opennlp:pom:2.5.2-SNAPSHOT.
[INFO]  * central (https://repo.maven.apache.org/maven2/, default, releases)
[INFO]    First introduced on root
[INFO]  * apache.snapshots (https://repository.apache.org/snapshots, default, releases+snapshots)
[INFO]    First introduced on root
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS

https://issues.apache.org/jira/browse/OPENNLP-1670

How was this patch tested?

$ mvn -N --batch-mode eu.maveniverse.maven.plugins:toolbox:list-repositories
[INFO] Scanning for projects...
[INFO] 
[INFO] ---------------------< org.apache.opennlp:opennlp >---------------------
[INFO] Building Apache OpenNLP Reactor 2.5.2-SNAPSHOT
[INFO]   from pom.xml
[INFO] --------------------------------[ pom ]---------------------------------
[INFO] 
[INFO] --- toolbox:0.6.0:list-repositories (default-cli) @ opennlp ---
[INFO] Remote repositories used by project org.apache.opennlp:opennlp:pom:2.5.2-SNAPSHOT.
[INFO]  * central (https://repo.maven.apache.org/maven2/, default, releases)
[INFO]    First introduced on root
[INFO]  * apache.snapshots (https://repository.apache.org/snapshots, default, snapshots)
[INFO]    First introduced on root

[adoroszlai]

Thanks @jzonthemtn, @kinow, @mawiesne for approving these pull requests. Can you please let me know if there is anything left before they can be merged?

[adoroszlai]

@rzo1 thanks for merging the PRs.