COO-1597 Raise memory limit of observability-operator deploy

[muellerfabi]

On a larger OCP 4.18 cluster with 66 nodes observability-operator 1.3.0 gets OOMKilled right after start.

Issue is reported in https://access.redhat.com/support/cases/#/case/04368491
Issue is tracked in https://issues.redhat.com/browse/COO-1597

[openshift-ci]

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[openshift-ci]

Hi @muellerfabi. Thanks for your PR.

I'm waiting for a rhobs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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