Bump legacy CLI to 4.26.0

[pjcdawkins]

Release notes: https://github.com/platformsh/legacy-cli/releases/v4.26.0

New features:

• Add autoscaling:set command, to configure CPU-based autoscaling
• Add support for organization types
  • Display the organization type in the orgs list
  • Add a --type filter in the orgs list
  • Add a --type option to org:create
  • Display the organization type in the projects list
  • Add an --org-type filter in the projects list
• Add a deploy alias for the env:deploy command

Other changes:

• Fix "This environment is inactive" during activation, if the deployment cannot
  be fetched.

[akalipetis]

LGTM