chore(deps): upgrade jenkins-x-plugins/jx-secret to version 0.4.18

from: https://github.com/jenkins-x-plugins/jx-secret.git

-----
# jenkins-x-plugins/jx-secret

## Changes in version 0.4.18

### Chores

* deps: bump github.com/golang-jwt/jwt/v5 from 5.2.1 to 5.2.2 (dependabot[bot])

Author: pow-devops2020

pkg/plugins/versions.go

@@ -34,7 +34,7 @@ const (
 	PromoteVersion = "0.6.28"
 
 	// SecretVersion the version of the jx secret plugin
-	SecretVersion = "0.4.17"
+	SecretVersion = "0.4.18"
 
 	// TestVersion the version of the jx test plugin
 	TestVersion = "0.4.10"