Update dependency org.testcontainers:testcontainers to v1.20.6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.testcontainers:testcontainers (source)	1.20.5 -> 1.20.6

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Release Notes

testcontainers/testcontainers-java (org.testcontainers:testcontainers)

v1.20.6

Compare Source

What's Changed

• Bump confluentinc/cp-kcat from 7.4.1 to 7.9.0 (#​10000) @​julianladisch
• Update testcontainers version to ${GITHUB_REF##*/} (#​9996) @​github-actions
• Update docs version to ${GITHUB_REF##*/} (#​9995) @​github-actions

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