fix: replace beforeunload to pagehide for safafi on ios

[jakkku]

Fixes #9463

here is the codesandbox
please check it in safari on ios

beforeunload event does not occur in safari on ios
Apple's documentation says to use pagehide instead of unload.

unload
Deprecated, use pagehide instead.

the mdn documentation says

When the user clicks the browser's back button,
the page hide event is fired on the current page before the previous page is displayed.

So I think it would be okay to use pagehide instead of beforeunload.

This is my first time working in react-router's codebase. Please let me know if there are any additional considerations

[changeset-bot]

🦋 Changeset detected

Latest commit: 29077f4

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 4 packages

Name	Type
react-router-dom	Patch
react-router	Patch
react-router-dom-v5-compat	Patch
react-router-native	Patch

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[remix-cla-bot]

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[brophdawg11]

Thanks @jakkku! We can't change useBeforeUnload directly since that would be a breaking change, but we can look into using the pagehide event inside <ScrollRestoration>. I'm going to merge this into a branch of mine to make those changes and do some testing.