Fix failing spec/models/internal_id_spec.rb spec

What does this MR do?

The spec is too strict about how many current_version should be called - if the spec is called separately, it's called 3 times, if all specs run it's called twice.

This is similar to the change done in 9b752791

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/63698

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation created/updated or follow-up review issue created
• Code review guidelines
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• Separation of EE specific content

Performance 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

Security

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• 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
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