Add new version line: python 3.14.2

[cf-buildpacks-eng]

Please edit the dependency-builds pipeline to add the new version line to the relevant dependency/buildpack.

For nginx/nginx-static: Also remove older mainline/stable version.
E.g. If you are adding nginx 1.22, you will remove 1.20. If you are adding 1.23, you will remove 1.21

{source:{name:python,type:python},version:{ref:3.14.2,url:https://www.python.org/ftp/python/3.14.2/Python-3.14.2.tgz,md5_digest:213fdd3cf28e89e2d779b6ae444ae8aa,sha256:c609e078adab90e2c6bacb6afafacd5eaf60cd94cf670f1e159565725fcd448d}}