[Snyk] Security upgrade docker from dind to 20.10-dind

[snyk-bot]

Keeping your Docker base image up-to-date means you’ll benefit from security fixes in the latest version of your chosen image.

Changes included in this PR

• docker-images/dind-kubo-ci/Dockerfile

We recommend upgrading to docker:20.10-dind, as this image has only 1 known vulnerabilities. To do this, merge this pull request, then verify your application still works as expected.

Some of the most important vulnerabilities in your base image include:

Severity	Priority Score / 1000	Issue	Exploit Maturity
	221	CVE-2021-36159 SNYK-ALPINE313-APKTOOLS-1533754	No Known Exploit
	571	NULL Pointer Dereference SNYK-ALPINE313-KRB5-1533445	No Known Exploit
	150	CVE-2021-24032 SNYK-ALPINE313-ZSTD-1315097	No Known Exploit

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