updating builder image to use JDK21 based image

[ayushsatyam146]

Updating builder image to UBI9 JDK21 Image and removing the references to install maven externally

[openshift-ci]

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[sayan-biswas]

We can use the 1.20 tag I guess, instead of using a digest.

[openshift-ci]

@ayushsatyam146: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-aws-jenkins-client-plugin	64a4170	link	true	/test e2e-aws-jenkins-client-plugin
ci/prow/security	64a4170	link	false	/test security

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