chore(deps): bump mvdan.cc/sh/v3 from 3.12.0 to 3.13.0 in /plugins/cron

Bumps [mvdan.cc/sh/v3](https://github.com/mvdan/sh) from 3.12.0 to 3.13.0.
- [Release notes](https://github.com/mvdan/sh/releases)
- [Changelog](https://github.com/mvdan/sh/blob/master/CHANGELOG.md)
- [Commits](https://github.com/mvdan/sh/compare/v3.12.0...v3.13.0)

---
updated-dependencies:
- dependency-name: mvdan.cc/sh/v3
  dependency-version: 3.13.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

plugins/cron/go.mod

@@ -9,7 +9,7 @@ require (
 	github.com/robfig/cron/v3 v3.0.1
 	github.com/ryanuber/columnize v2.1.2+incompatible
 	github.com/spf13/pflag v1.0.10
-	mvdan.cc/sh/v3 v3.12.0
+	mvdan.cc/sh/v3 v3.13.0
 )
 
 require (
@@ -29,7 +29,7 @@ require (
 	github.com/tailscale/hujson v0.0.0-20250605163823-992244df8c5a // indirect
 	golang.org/x/crypto v0.48.0 // indirect
 	golang.org/x/sync v0.20.0 // indirect
-	golang.org/x/sys v0.41.0 // indirect
+	golang.org/x/sys v0.42.0 // indirect
 	k8s.io/utils v0.0.0-20240102154912-e7106e64919e // indirect
 )