chore(deps): update ohdsi docker tag to v0.21.6

[renovate]

This PR contains the following updates:

Package	Update	Change
ohdsi	patch	0.21.5 -> 0.21.6

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🦙 MegaLinter status: ❌ ERROR

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✅ GROOVY	npm-groovy-lint	4		0	13.54s
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