Bump golang from 1.15.3 to 1.15.5
Bump golang from 1.15.3 to 1.15.5

Bumps golang from 1.15.3 to 1.15.5.

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
chop-dbhi/prometheus-sql,chop-dbhi/prometheus-sql