Update moment and moment-timezone packages to fix timezone issues

[wojtekn]

What?

In this PR, I propose to update the moment and moment-timezone packages to match the versions used by WP core.

Why?

It should fix the timezone-related issues e.g. Automattic/wp-calypso#71529 and fix #47698

How?

moment-timezone package is being updated to catch with IANA time zone database changes. Last year some time zones were renamed e.g. Kiev to Kyiv (moment/moment-timezone#986). This update should fix issues for such timezone, and possibly it will fix other issues related to timezones.

Testing Instructions

1. Set WordPress's timezone setting to Kyiv
2. Edit or Add a new post.
3. Open the DateTimePicker component by trying to schedule a post.
4. Choose date and hour
5. Save post
6. Open the DateTimePicker component and confirm that hour displayed is the same as in the block
7. Confirm that there is no "Moment Timezone has no data for Europe/Kyiv." JS error in the browser console

Testing Instructions for Keyboard

N/A

Screenshots or screencast

Incorrect	Correct

[gziolo]

moment is externalized in the context of WordPress so we don't have to worry about that part as it's pure for development purposes in the repository and for 3rd party consumes of npm packages. There is a slight increase in the bundle size for moment-timezone but that shouldn't be a blocker:

Before

After

[gziolo]

I haven't tested the changes, but they look correct and all CI cheks still pass. I can confirm that the version of moment aligns now with WordPress core:

https://github.com/WordPress/wordpress-develop/blob/7104aa0a9c75b64ee0bb5e5390bb564519e3022d/package.json#L151

The only caveat is that in core, it's pinned and here we correctly allow newer versions to avoid locking 3rd party package consumers.

[tyxla]

Looks good, tests well too, thanks @wojtekn 👍

The bundle size change is unfortunate, but it's one more signal that we should be seeking ways to get rid of moment completely at some point. There is an open issue about it for anyone interested: #43533

[gziolo]

@Mamaduka or @ntsekouras – is it something you would be fine adding to the scope of the WordPress 6.2 release?

[Mamaduka]

@gziolo matching the library versions makes sense to me 👍

[ntsekouras]

Cherry-picked this PR to the wp/6.2 branch.