Bump golang from 1.15.2 to 1.15.3
Bump golang from 1.15.2 to 1.15.3

Bumps golang from 1.15.2 to 1.15.3.

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
shogo82148/go-nginx-oauth2-adapter