Update CLO install channel

[rhmdnd]

Using stable-6.1 apparently hangs. Using 6.3 installs the latest CLO.
Without this change the remediations hang in the ocp4e2e testing because
CLO never installs.

[openshift-ci]

@rhmdnd: 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-openshift-node-compliance	d290d20	link	true	/test e2e-aws-openshift-node-compliance
ci/prow/e2e-aws-openshift-platform-compliance	d290d20	link	true	/test e2e-aws-openshift-platform-compliance

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[yuumasato]

@rhmdnd Unrelated to this PR, the node and platform tests are not working as expected.
After the pushd command $PWD is not what we want it to be...

 + pushd ocp4e2e
/go/src/github.com/ComplianceAsCode/content/ocp4e2e /go/src/github.com/ComplianceAsCode/content
+ go test . '-run=^TestPlatformCompliance$' -test-type=platform -content-image=ocp4-content-ds -content-directory=/go/src/github.com/ComplianceAsCode/content/ocp4e2e 

[yuumasato]

@rhmdnd I'm afraid this might not work, stable-6.3 is not available all across the board.

Check this one out: #13920

[rhmdnd]

Thanks for the alternative @yuumasato - let's pursue that instead.