[w3c/push-api] Normative references to discontinued specs in Push API (Issue #390)

While crawling [Push API](https://w3c.github.io/push-api/), the following normative references were detected as pointing to discontinued specifications:
* [ ] [RFC7231](https://httpwg.org/specs/rfc7231.html) has been obsoleted by [rfc9110](https://httpwg.org/specs/rfc9110.html)

<sub>This issue was detected and reported semi-automatically by [Strudy](https://github.com/w3c/strudy/) based on data collected in [webref](https://github.com/w3c/webref/).</sub>


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