chore(deps): pin docker.io/bitnami/kubectl docker tag to 493d1b8

[renovate]

This PR contains the following updates:

Package	Update	Change
docker.io/bitnami/kubectl (source)	pinDigest	-> 493d1b8

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[bartsmykla]

Need to test if this works first: https://github.com/Kong/slsa-generator/blob/ae9276d8a3298fb9f2ad96352381667c6713b606/RENOVATE.md?plain=1#L1-L19

[github-actions]

Reviewer Checklist

🔍 Each of these sections need to be checked by the reviewer of the PR 🔍:
If something doesn't apply please check the box and add a justification if the reason is non obvious.

• Is the PR title satisfactory? Is this part of a larger feature and should be grouped using > Changelog?
• PR description is clear and complete. It Links to relevant issue as well as docs and UI issues
• This will not break child repos: it doesn't hardcode values (.e.g "kumahq" as an image registry)
• IPv6 is taken into account (.e.g: no string concatenation of host port)
• Tests (Unit test, E2E tests, manual test on universal and k8s)
  • Don't forget ci/ labels to run additional/fewer tests
• Does this contain a change that needs to be notified to users? In this case, UPGRADE.md should be updated.
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