fix(deps): update netresearch/go-cron to v0.16.0 (#802)

Part of the release train: go-cron v0.16.0 is the first release with the
Go 1.26 floor; this module already builds with go 1.26, so only the
version moves. Build, vet, golangci-lint (0 issues) and the race suite
(14 packages) green locally under go1.27.0.

_Assisted by claude-code:claude-fable-5 —
[Session](https://claude.ai/code/session_01L7tF9XuJfAfFk4yuY5KfPK)_

Author: CybotTM

go.mod

@@ -21,7 +21,7 @@ require (
 	github.com/manifoldco/promptui v0.9.0
 	github.com/moby/moby/api v1.55.0
 	github.com/moby/moby/client v0.5.1
-	github.com/netresearch/go-cron v0.15.1
+	github.com/netresearch/go-cron v0.16.0
 	github.com/opencontainers/image-spec v1.1.1
 	github.com/stretchr/testify v1.12.1
 	golang.org/x/crypto v0.55.0

go.sum

@@ -95,8 +95,8 @@ github.com/moby/moby/api v1.55.0 h1:2/sexvQyqIWS8pRSCFddBfpW2qE7vR7FCL+vN8pxwMc=
 github.com/moby/moby/api v1.55.0/go.mod h1:+RQ6wluLwtYaTd1WnPLykIDPekkuyD/ROWQClE83pzs=
 github.com/moby/moby/client v0.5.1 h1:tYNaJno4c0HXz12y5BiqEDy0rVTYkWzI26lGvnTMiJw=
 github.com/moby/moby/client v0.5.1/go.mod h1:odLstlZ6uSnfvAgVxMpvgmb8SUdd+siH2T0GBuxVAlM=
-github.com/netresearch/go-cron v0.15.1 h1:bTqeJwHizd5fZWlU1CPtzrCILAkp6UL8KLW4IU7HRhk=
-github.com/netresearch/go-cron v0.15.1/go.mod h1:79iktHfV90py3jcaFUtWcGSKbZXRev+WwoLMyV5eMvo=
+github.com/netresearch/go-cron v0.16.0 h1:b14Vnfobzm8pyBuyqbVvyV4xAi3DDREJz+5mzWil8Ew=
+github.com/netresearch/go-cron v0.16.0/go.mod h1:IADGFX1B9VxD6hc1WdmXjhRwe2g3SKIAEbEZQ/ON8Oo=
 github.com/opencontainers/go-digest v1.0.0 h1:apOUWs51W5PlhuyGyz9FCeeBIOUDA/6nW8Oi/yOhh5U=
 github.com/opencontainers/go-digest v1.0.0/go.mod h1:0JzlMkj0TRzQZfJkVvzbP0HBR3IKzErnv2BNG4W4MAM=
 github.com/opencontainers/image-spec v1.1.1 h1:y0fUlFfIZhPF1W537XOLg0/fcx6zcHCJwooC2xJA040=