Snyk: exclude Python docs requirements.txt

[qbarrand]

/cc @yevgeny-shnaidman

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[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: qbarrand

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[openshift-ci]

@qbarrand: 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/security	8d8c49c	link	false	/test security

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[qbarrand]

/hold

[yevgeny-shnaidman]

/lgtm