OWNERS: add Java team as owner of Java module

It is within our scope.

The general team consensus seems to be that it is in a similar position
to nix-ld: in-tree users should migrate away from it, but out-of-tree
users can use it as a workaround, in place of a wrapper.

ci/OWNERS

@@ -218,6 +218,7 @@ pkgs/development/python-modules/buildcatrust/ @ajs124 @lukegb @mweinelt
 /doc/languages-frameworks/java.section.md @NixOS/java
 /doc/languages-frameworks/gradle.section.md @NixOS/java
 /doc/languages-frameworks/maven.section.md @NixOS/java
+/nixos/modules/programs/java.nix @NixOS/java
 /pkgs/top-level/java-packages.nix @NixOS/java
 
 # Jetbrains