swagger: fix type for BuildCache CreatedAt and LastUsedAt
swagger: fix type for BuildCache CreatedAt and LastUsedAt

Signed-off-by: Sebastiaan van Stijn <64b2b6d12bfe4baae7dad3d018f8cbf6b0e7a044@gone.nl>

justincormack/docker,vdemeester/docker,nawawi/docker,vdemeester/docker,kojiromike/docker,ibuildthecloud/docker,konstruktoid/docker-upstream,bearstech/moby,gnailuy/docker,konstruktoid/docker-upstream,AkihiroSuda/docker,nalind/docker,Mokolea/docker,nalind/docker,vdemeester/docker,flavio/docker,nawawi/docker,jthelin/docker,djs55/docker,nalind/docker,trebonian/docker,bearstech/moby,kojiromike/docker,ibuildthecloud/docker,kojiromike/docker,thaJeztah/docker,mahak/docker,jameszhan/docker,cpuguy83/docker,ibuildthecloud/docker,jimjag/docker,Ramzec/docker,thaJeztah/docker,estesp/docker,paralin/docker,trebonian/docker,paralin/docker,mahak/docker,yosifkit/docker,djs55/docker,konstruktoid/docker-1,jameszhan/docker,dims/docker,konstruktoid/docker-upstream,nawawi/docker,trebonian/docker,moul/docker,konstruktoid/docker-1,paralin/docker,moul/docker,Ramzec/docker,flavio/docker,estesp/docker,Ramzec/docker,docker/docker,jimjag/docker,thaJeztah/docker,moby/moby,yosifkit/docker,moby/moby,thaJeztah/docker,dims/docker,dims/docker,bearstech/moby,jimjag/docker,docker/docker,Mokolea/docker,jameszhan/docker,mahak/docker,cpuguy83/docker,AkihiroSuda/docker,Mokolea/docker,trebonian/docker,jthelin/docker,estesp/docker,cpuguy83/docker,ibuildthecloud/docker,yosifkit/docker,justincormack/docker,paralin/docker,flavio/docker,konstruktoid/docker-upstream,justincormack/docker,gnailuy/docker,djs55/docker,flavio/docker,gnailuy/docker,moul/docker,yosifkit/docker,cpuguy83/docker,jimjag/docker,nawawi/docker,docker/docker,ibuildthecloud/docker,Ramzec/docker,nalind/docker,Mokolea/docker,AkihiroSuda/docker,bearstech/moby,moby/moby,AkihiroSuda/docker,mahak/docker,moul/docker,gnailuy/docker,konstruktoid/docker-1,moby/moby