Use Rocky Linux instead of CentOS for rules_java BCR presubmits

See https://github.com/bazelbuild/continuous-integration/issues/2272

(ignore-relnotes)

PiperOrigin-RevId: 762345962
Change-Id: I68a6e1805418144d409d2afd1a51d77f37df40fe
diff --git a/.bcr/presubmit.yml b/.bcr/presubmit.yml
index c81cf08..26dad0f 100644
--- a/.bcr/presubmit.yml
+++ b/.bcr/presubmit.yml
@@ -1,6 +1,6 @@
 matrix:
   platform:
-  - centos7
+  - rockylinux8
   - debian10
   - macos
   - ubuntu2004