[TASK] Raise guzzlehttp/promises to v2

The update brings PHP 7 typehints to guzzlehttp/promises.
guzzlehttp/guzzle mainly raised for guzzlehttp/promises v2
compatibility, but also contains a bugfix for SetCookie::fromString.

> composer require -W guzzlehttp/guzzle:^7.7.0
> composer require guzzlehttp/promises:^2.0
> composer require --no-update guzzlehttp/promises:^2.0 \
  -d typo3/sysext/install/
> composer require --no-update guzzlehttp/guzzle:^7.7.0 \
  -d typo3/sysext/core/

- Upgrading guzzlehttp/guzzle (7.5.1 => 7.7.0)
- Upgrading guzzlehttp/promises (1.5.3 => 2.0.0)

Resolves: #100919
Releases: main, 12.4, 11.5
Change-Id: I3183f2619a060ec768646b1c4a97fdf937312514
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/79142


Reviewed-by: Benni Mack <benni@typo3.org>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Nikita Hovratov <nikita.h@live.de>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Nikita Hovratov <nikita.h@live.de>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Benni Mack <benni@typo3.org>