refactor(compose): rename dependent service parameter

[vividvisit]

What I did

Renamed the local dependant parameter to dependent in waitDependencies and its error message construction.

Related issue

(not mandatory) A picture of a cute animal, if possible in relation to what you did

[glours]

Thanks for the contribution. Both dependant and dependent are valid spellings, so there's no real error being fixed here, and as-is, this PR doesn't compile: the parameter is renamed at pkg/compose/service_containers.go:162 (and updated at lines 180/182), but the call site at line 187 (s.waitDependency(ctx, dependant, dep, ...)) still references the old dependant name, which no longer exists in scope, go build fails with undefined: dependant.

Closing without merging.