v4.0.0

Disable process functions @goruha (#26)

## Breaking Change! * Requires `atmos >= 1.158.0`. Will fail on older version

what

• Disable process functions for cloudposse/github-action-atmos-get-setting

why

• process-functions requires terraform. Which we install after fetching the version
• process-functions can cause an issue where cached terraform versions conflict with the version we want to install
• atmos < 1.158.0 not not support flag --process-functions