Release: nginx-buildpack (Aug)

[cf-buildpacks-eng]

Release reminder for nginx-buildpack

• See diff from latest version and validate if a release is required.
• Make sure the latest commit on has passed tests on the CI
• Refer release instructions. (private link)

[arjun024]

https://github.com/cloudfoundry/nginx-buildpack/releases/tag/v1.2.6