chore(deps): update golang docker tag to v1.15

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
golang	final	minor	1.14 -> 1.15

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[github-actions[bot]]

🏷️ [bumpr] Next version:v1.2.1 Changes:v1.2.0...reviewdog:renovate/docker-golang-1.x

[github-actions[bot]]

🚀 [bumpr] Bumped! New version:v1.2.1 Changes:v1.2.0...v1.2.1