Include 30 to the day range of the recovery window

[terranisu]

Description

A follow-up PR to #21 to fix the validation failure when the delete_in value is set to the default value:

│ Error: Invalid value for variable
│ 
│   on .terraform/modules/app_go_chassis.secrets/variables.tf line 24:
│   24: variable "delete_in" {
│ 
│ The delete_in value must be 0 or between 7 and 30.

Testing considerations

The fix is tested in on of our root modules

Checklist

• Prefixed the PR title with the JIRA ticket code
• Performed simple, atomic commits with good commit messages
• Verified that the commit history is linear and commits are squashed as necessary
• Thoroughly tested the changes in development and/or staging
• Updated the README.md as necessary

Related links

• Add delete_in argument #21

[Neurostep]

LGTM 🚀