Update gitlab-license gem to 1.3.0

What does this MR do?

Related to https://gitlab.com/gitlab-org/customers-gitlab-com/-/issues/2682.

Updates the gitlab-license gem to the latest (v1.3.0). This gem was previously at v1.0.0. This is mostly a trivial update with non-breaking changes (mostly style and development changes). It does include a few changes to prepare for cloud license, including the addition of 3 new attributes:

• "sync"
• "last_synced_at"
• "next_sync_at"

You can see the full diff of changes between v1.0.0 and v1.3.0 here: https://dev.gitlab.org/gitlab/gitlab-license/-/compare/v1.0.0...v1.3.0

These cloud license changes won't be used in GL immediately but it would be good to keep this app up-to-date with the latest version of the gem.

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry
• [-] Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• [-] Tested in all supported browsers
• [-] Informed Infrastructure department of a default or new setting change, if applicable per definition of done

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• [-] Label as security and @ mention @gitlab-com/gl-security/appsec
• [-] The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• [-] Security reports checked/validated by a reviewer from the AppSec team