Add nginx version 1.21.x to relevant buildpacks
Add nginx version 1.21.x to relevant buildpacks

Signed-off-by: Amelia Castilla <54f3f6e07f43db2ab1d225207b300d2c050958d3@vmware.com>

cloudfoundry/buildpacks-ci,cloudfoundry/buildpacks-ci,cloudfoundry/buildpacks-ci,cloudfoundry/buildpacks-ci,cloudfoundry/buildpacks-ci