Fix perpetual diff in StatefulSet

[dak1n1]

Description

Fixes #1088

Acceptance tests

• Have you added an acceptance test for the functionality being added?
• Have you run the acceptance tests on this branch?

Output from acceptance testing:

The acceptance test for this one is in #1074, but it passed a manual test using the reproducer from the bug:

kubernetes_stateful_set.test: Creating...
kubernetes_stateful_set.test: Creation complete after 8s [id=default/test]

Apply complete! Resources: 1 added, 0 changed, 0 destroyed.

$ terraform plan
kubernetes_stateful_set.test: Refreshing state... [id=default/test]

No changes. Infrastructure is up-to-date.

Release Note

Release note for CHANGELOG:

Fix perpetual diff in StatefulSet when update_strategy is not specified (#1088)

References

Community Note

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[jrhouston]

Looks good 🤠 🚀

[ghost]

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