chore(deps): update plugins/docker docker tag to v21

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
plugins/docker	docker	major	18 → 21
plugins/docker	docker	major	20.17.4-windows-1809-amd64 → 21.2.9-windows-1809-amd64

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Release Notes

drone-plugins/drone-docker (plugins/docker)

v21

Full Changelog

Merged pull requests:

• bump to version 20.10.9: #​342 (eoinmcafee00)
• Upgrade Docker dind to 20.10.9 for 64bit platforms #​334 (gzm0)

v20

Full Changelog

Implemented enhancements:

• Allow gcr authentication with workload identity #​383 (dhpollack)

Fixed bugs:

• [fix]: [ci-9254]: go version upgrade to 1.21 #​401 (abhay084)
• Revert "Add support for AAD auth for docker-acr" #​398 (tphoney)

Closed issues:

• Remove deprecated support of label-schema in favor of OCI #​396

Merged pull requests:

• Add support for AAD auth for docker-acr #​395 (rutvijmehta-harness)

v19

Full Changelog

Merged pull requests:

• new release to fix window semver error #​354 (eoinmcafee00)
• (feat) publish docker data to create drone card #​347 (eoinmcafee00)

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