Update file tech_stack.yml

Tech Stack Update

Updating the Cloudflare tech stack entry to set the deprovisioners = to the provisioners. Currently the deprovisioner is set as 'Okta' but Cloudflare is a direct login only system and does not utilize Okta.

Please do not merge this MR before the Business Systems Analysts have reviewed and approved.

Please take into account:

• If changing provisioners: You must also open an Update Tech Stack provisioner issue so all templates and Tech Stack information can be updated.
• If completing a system offboarding:
  • Open an issue for Tech Stack offboarding

Security Risk (@gitlab-com/gl-security/security-assurance/security-risk-team)

Not required prior to merging

• Create Tech Stack Update Issue in StORM board and Link Here
• Once updates are finalized, reconcile changes with the ZenGRC System of Record

/cc @marc_disabatino @gitlab-com/gl-security/security-assurance/security-risk-team