Bump github.com/cloudflare/cfssl from 1.5.0 to 1.6.0

Bumps [github.com/cloudflare/cfssl](https://github.com/cloudflare/cfssl) from 1.5.0 to 1.6.0.
- [Release notes](https://github.com/cloudflare/cfssl/releases)
- [Changelog](https://github.com/cloudflare/cfssl/blob/master/CHANGELOG)
- [Commits](cloudflare/cfssl@v1.5.0...v1.6.0)

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

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

Author: dependabot[bot]

go.mod

@@ -3,7 +3,7 @@ module github.com/rabbitmq/cluster-operator
 go 1.16
 
 require (
-	github.com/cloudflare/cfssl v1.5.0
+	github.com/cloudflare/cfssl v1.6.0
 	github.com/eclipse/paho.mqtt.golang v1.3.4
 	github.com/elastic/crd-ref-docs v0.0.7
 	github.com/go-delve/delve v1.6.1