fix: do not format `DefaultMode` & `Mode` to octal representation

[enkron]

Description

It looks like the default_mode value actually accepts a decimal number which is then converted to an octal value, for example if the "0420" is specified as a default access mode it's converts to the 272 (which is the result of converting 0420 to 0o272).

Acceptance tests

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

References

https://github.com/hashicorp/terraform-provider-kubernetes/issues/2541

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[hashicorp-cla-app[bot]]

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