Add Bazel 9.x to `rules_java`'s BCR presubmits

PiperOrigin-RevId: 962709107
Change-Id: I10c28029b1303d6677d153456d66d356a46fa329

.bcr/presubmit.yml

diff --git a/.bcr/presubmit.yml b/.bcr/presubmit.yml
index 26dad0f..6d22134 100644
--- a/.bcr/presubmit.yml
+++ b/.bcr/presubmit.yml
@@ -8,6 +8,7 @@
   bazel:
   - 7.x
   - 8.x
+  - 9.x
 tasks:
   verify_build_targets:
     name: "Verify build targets w/ Bazel {bazel}"