Update k8s testing version to latest

[ChrsMark]

What does this PR do?

Updates k8s version we use for testing to the latest one.

Part of https://github.com/elastic/observability-dev/issues/2178

[elasticmachine]

💔 Build Failed

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Build stats

• Start Time: 2022-06-02T10:34:03.701+0000

• Duration: 36 min 17 sec

Test stats 🧪

Test	Results
Failed	0
Passed	720
Skipped	0
Total	720

Steps errors

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• Took 4 min 34 sec . View more details here
• Description: make install test-stack-command-8x check-git-clean

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[elasticmachine]

🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (30/30)	💚
Files	64.22% (70/109)	👍
Classes	58.278% (88/151)	👍
Methods	47.421% (285/601)	👍
Lines	32.348% (2616/8087)	👍
Conditionals	100.0% (0/0)	💚

[ChrsMark]

Any ideas about the CI failure?

[mtojek]

Yes, we're waiting until elastic/elastic-agent#495 gets into Docker image.

[ChrsMark]

Shall I proceed with merge then?
Actually I don't have permissions to do so...