Update alpine Docker tag to v3.14

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
alpine	final	minor	3.13 -> 3.14

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[github-actions[bot]]

🏷️ [bumpr] Next version:v1.8.1 Changes:v1.8.0...reviewdog:renovate/alpine-3.x

[github-actions[bot]]

🚀 [bumpr] Bumped! New version:v1.8.1 Changes:v1.8.0...v1.8.1