chore(deps): Bump github.com/coreos/butane from 0.19.0 to 0.20.0

Bumps [github.com/coreos/butane](https://github.com/coreos/butane) from 0.19.0 to 0.20.0.
- [Release notes](https://github.com/coreos/butane/releases)
- [Changelog](https://github.com/coreos/butane/blob/main/docs/release-notes.md)
- [Commits](coreos/butane@v0.19.0...v0.20.0)

---
updated-dependencies:
- dependency-name: github.com/coreos/butane
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

go.mod

@@ -4,7 +4,7 @@ go 1.21
 
 require (
 	github.com/blang/semver/v4 v4.0.0
-	github.com/coreos/butane v0.19.0
+	github.com/coreos/butane v0.20.0
 	github.com/coreos/ignition/v2 v2.18.0
 	github.com/go-logr/logr v1.4.1
 	github.com/onsi/ginkgo/v2 v2.17.1

go.sum

@@ -49,8 +49,8 @@ github.com/coredns/caddy v1.1.0 h1:ezvsPrT/tA/7pYDBZxu0cT0VmWk75AfIaf6GSYCNMf0=
 github.com/coredns/caddy v1.1.0/go.mod h1:A6ntJQlAWuQfFlsd9hvigKbo2WS0VUs2l1e2F+BawD4=
 github.com/coredns/corefile-migration v1.0.21 h1:W/DCETrHDiFo0Wj03EyMkaQ9fwsmSgqTCQDHpceaSsE=
 github.com/coredns/corefile-migration v1.0.21/go.mod h1:XnhgULOEouimnzgn0t4WPuFDN2/PJQcTxdWKC5eXNGE=
-github.com/coreos/butane v0.19.0 h1:F4uuWwIaOCA6YrBOKoVU1cb25SMIkuValW9p1/PXyO8=
-github.com/coreos/butane v0.19.0/go.mod h1:dfa3/aWa58qfWMK/CGm3OR3T328x6x2nm66MgZURCTs=
+github.com/coreos/butane v0.20.0 h1:lKdyBDazlM5cenywmAT6Fcwp5B2rVeYtIqZDSbYu3MA=
+github.com/coreos/butane v0.20.0/go.mod h1:JPxQB/3omxqSg1ZWAOg5x3aslzx4nDvmb7Wyv8gC150=
 github.com/coreos/go-json v0.0.0-20230131223807-18775e0fb4fb h1:rmqyI19j3Z/74bIRhuC59RB442rXUazKNueVpfJPxg4=
 github.com/coreos/go-json v0.0.0-20230131223807-18775e0fb4fb/go.mod h1:rcFZM3uxVvdyNmsAV2jopgPD1cs5SPWJWU5dOz2LUnw=
 github.com/coreos/go-semver v0.3.1 h1:yi21YpKnrx1gt5R+la8n5WgS0kCrsPp33dmEyHReZr4=