ci(mergify): upgrade configuration to current format #231

Job	Run time
terraform-module / CI / Labels Validate	3s
terraform-module / CI / Find modules	4s
terraform-module / CI / bats	31s
terraform-module / CI / Format HCL	16s
terraform-module / CI / Validate Codeowners (syntax)	7s
terraform-module / CI / Validate Codeowners (owners)	0s
terraform-module / Readme	0s
terraform-module / CI / Lint (.)	11s
terraform-module / CI / Lint (./examples/complete)	12s
terraform-module / CI / Lint (./examples/minimum)	14s
terraform-module / ci	3s
terraform-module / Release	0s
	1m 41s

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