chore(deps): update golang docker tag to v1.20

[renovate-bot]

This PR contains the following updates:

Package	Type	Update	Change
golang	stage	minor	1.15-buster -> 1.20-buster

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[github-actions[bot]]

This PR is stale because it has been open 60 days with no activity. Remove stale label or comment or this will be closed in 7 days

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[github-actions[bot]]

This PR is stale because it has been open 60 days with no activity. Remove stale label or comment or this will be closed in 7 days

[forking-renovate[bot]]

Renovate Ignore Notification

Because you closed this PR without merging, Renovate will ignore this update (1.20-buster). You will get a PR once a newer version is released. To ignore this dependency forever, add it to the ignoreDeps array of your Renovate config.

If you accidentally closed this PR, or if you changed your mind: rename this PR to get a fresh replacement PR.