Add composer 2.1.5, remove composer 2.1.4
Add composer 2.1.5, remove composer 2.1.4

for stack(s) cflinuxfs3 [#178985789]

cloudfoundry/php-buildpack,cloudfoundry/php-buildpack,cloudfoundry/php-buildpack,cloudfoundry/php-buildpack,cloudfoundry/php-buildpack,cloudfoundry/php-buildpack,cloudfoundry/php-buildpack