Add nginx 1.13.12, remove nginx 1.13.11
Add nginx 1.13.12, remove nginx 1.13.11

source url: http://nginx.org/download/nginx-1.13.12.tar.gz
source gpg-signature:
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[#156657474]

cloudfoundry/php-buildpack,cloudfoundry/php-buildpack,cf-identity/php-buildpack,cf-identity/php-buildpack,cf-identity/php-buildpack,cf-identity/php-buildpack,cloudfoundry/php-buildpack,cloudfoundry/php-buildpack,cf-identity/php-buildpack,cloudfoundry/php-buildpack,cf-identity/php-buildpack,cloudfoundry/php-buildpack,cf-identity/php-buildpack,cloudfoundry/php-buildpack