git request-pull [-p] <start> <url> [<end>]
The upstream project is expected to have the commit named by <start> and the output asks it to integrate the changes you made since that commit, up to the commit named by <end>, by visiting the repository named by <url>.
When the repository named by <url> has the commit at a tip of a ref that is different from the ref you have locally, you can use the <local>:<remote> syntax, to have its local name, a colon :, and its remote name.
git push https://git.ko.xz/project master
Then, you run this command:
git request-pull v1.0 https://git.ko.xz/project master
which will produce a request to the upstream, summarizing the changes between the v1.0 release and your master, to pull it from your public repository.
If you pushed your change to a branch whose name is different from the one you have locally, e.g.
git push https://git.ko.xz/project master:for-linus
then you can ask that to be pulled with
git request-pull v1.0 https://git.ko.xz/project master:for-linus