chore(deps): update registry.redhat.io/openshift-logging/vector-rhel8 docker tag to v0.28

[red-hat-konflux]

This PR contains the following updates:

Package	Update	Change
registry.redhat.io/openshift-logging/vector-rhel8	minor	v0.21 -> v0.28

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[ludydoo]

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[kovayur]

/retest

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[kurlov]

/rebase

[kurlov]

/override ci/prow/e2e

[openshift-ci]

@kurlov: Overrode contexts on behalf of kurlov: ci/prow/e2e

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[openshift-ci]

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