feat(Dockerfile): modify base image to be ubi-micro to reduce CVEs

[jcantrill]

ref: LOG-9959

cc @vparfonov @Clee2691

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[APPROVALNOTIFIER] This PR is APPROVED

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[jcantrill]

/test unit

[jcantrill]

/label verified

Confirmed CI image build is using base image defined by the Dockerfile which is ubi-micro instead of replacing it

[vparfonov]

/lgtm

[openshift-ci]

@jcantrill: 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/cluster-logging-operator-e2e	95278ff	link	unknown	/test cluster-logging-operator-e2e

Full PR test history. Your PR dashboard.

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