Bump alpine from 3.11.5 to 3.11.6
Bump alpine from 3.11.5 to 3.11.6

Bumps alpine from 3.11.5 to 3.11.6.

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
mackerelio/mkr,mackerelio/mkr