Update github.com/imdario/mergo to v0.3.16 or higher

[nmiculinic]

Currently dependency github.com/imdario/mergo is at v0.3.15.

I'm writing code-generation code creating ClickhouseInstalation CRDs, thus would like to import APIs. Other project parts use github.com/imdario/mergo is at v0.3.16. Thus I'm having following compilation errors:

# github.com/altinity/clickhouse-operator/pkg/apis/clickhouse.altinity.com/v1
../../go/pkg/mod/github.com/altinity/[email protected]/pkg/apis/clickhouse.altinity.com/v1/type_templates.go:181:54: undefined: mergo.WithSliceDeepMerge
../../go/pkg/mod/github.com/altinity/[email protected]/pkg/apis/clickhouse.altinity.com/v1/type_templates.go:219:54: undefined: mergo.WithSliceDeepMerge
../../go/pkg/mod/github.com/altinity/[email protected]/pkg/apis/clickhouse.altinity.com/v1/type_templates.go:252:54: undefined: mergo.WithSliceDeepMerge

thus I have to resort to unstructured.Unstructured and not go API components