Increase memory for Eventing mt-broker-controller

[rh-hemartin]

Followup for #5291, the controller keeps failing. I keep not being able to reproduce it locally. Sorry about it.

[rh-hemartin]

/lgtm

[openshift-ci]

@rh-hemartin: you cannot LGTM your own PR.

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/lgtm

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[hugares]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hugares, maruiz93, rh-hemartin

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[openshift-ci]

@rh-hemartin: The following test 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/appstudio-e2e-tests	4cfafe9	link	unknown	/test appstudio-e2e-tests

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