Update minimum cmake version to 3.14 to match dependencies

[ssnover]

See #161

[google-cla]

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[ssnover]

@antiagainst do I need to bump this branch with an empty commit or something to get the CLA check to re-run? I followed the workflow but I'm not sure if it's showing failed because the workflow requires time to complete or has to be triggered to run again.

[ssnover]

Ah nevermind, I previously missed the button to trigger the rescan.