chore: add members to security-team for spark-operator CVE fixes

[RobuRishabh]

Summary

1. Add @alimaredia and @vjanelle to Kubeflow org members list.
2. Add @RobuRishabh, @alimaredia, @vikas-saxena02, @vjanelle, and @tariq-hasan to the security-team so they can work on fixing CVEs in the spark-operator repo.

Test output

============================= test session starts ==============================
platform darwin -- Python 3.13.7, pytest-9.0.3, pluggy-1.6.0
collected 1 item

test_org_yaml.py::test_team_member_is_in_org PASSED                      [100%]

============================== 1 passed in 0.08s ===============================

cc: @andreyvelich

[andreyvelich]

Thank you @RobuRishabh!
/lgtm
/approve
cc @kubeflow/wg-data-chairs

[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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