Add httpd 2.4.28, remove httpd 2.4.27
Add httpd 2.4.28, remove httpd 2.4.27

[#151371394]

cf-identity/php-buildpack,cloudfoundry/php-buildpack,cloudfoundry/php-buildpack,cf-identity/php-buildpack,cf-identity/php-buildpack,cf-identity/php-buildpack,Orange-OpenSource/cf-php-build-pack,Orange-OpenSource/cf-php-build-pack,cf-identity/php-buildpack,cloudfoundry/php-buildpack,cf-identity/php-buildpack,cf-identity/php-buildpack,cloudfoundry/php-buildpack,cloudfoundry/php-buildpack,Orange-OpenSource/cf-php-build-pack,cloudfoundry/php-buildpack,cloudfoundry/php-buildpack