Bump golang from 1.14.7 to 1.15.0
Bump golang from 1.14.7 to 1.15.0

Bumps golang from 1.14.7 to 1.15.0.

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