Update CODEOWNERS with Jason Krause/ Blake Hearn as codeowners for anchore....

Summary

Updated file with nick nellis as istio codeowner, jason krause and blake hearn as codeowners for anchore; removed andre

/cc @someoneelse

- [ISTIO Control Plane](https://repo1.dso.mil/platform-one/big-bang/apps/core/istio-controlplane/-/merge_requests/26)
- [GateKeeper](https://repo1.dso.mil/platform-one/big-bang/apps/core/policy/-/merge_requests/14)
- [Twistlock](https://repo1.dso.mil/platform-one/big-bang/apps/security-tools/twistlock/-/merge_requests/12)
- [Anchore](https://repo1.dso.mil/platform-one/big-bang/apps/security-tools/anchore-enterprise/-/merge_requests/13)
- [KeyCloak](https://repo1.dso.mil/platform-one/big-bang/apps/security-tools/keycloak/-/merge_requests/2)
- [Authservice](https://repo1.dso.mil/platform-one/big-bang/apps/core/authservice/-/merge_requests/13)
- [ArgoCD](https://repo1.dso.mil/platform-one/big-bang/apps/core/argocd/-/merge_requests/20)

See merge request platform-one/big-bang/bigbang!280