[BUGFIX] Update guzzlehttp/guzzle to 6.5.8

The maintainers of the package guzzlehttp/guzzle released a new version
6.5.8 that fixes two security issues:

* CURLOPT_HTTPAUTH option not cleared on change of origin [1]
* Change in port should be considered a change in origin [2]

Executed commands:

    composer require \
        guzzlehttp/guzzle:^6.5.8 \
        -W
    composer require \
        -d typo3/sysext/core \
        guzzlehttp/guzzle:^6.5.8 \
        --no-update

[1] https://github.com/guzzle/guzzle/security/advisories/GHSA-25mq-v84q-4j7r
[2] https://github.com/guzzle/guzzle/security/advisories/GHSA-q559-8m2m-g699

Resolves: #97802
Releases: main, 11.5, 10.4
Change-Id: Ia49f75f8ed078beb43ba42f89efdd8e68ee146c5
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/74973


Tested-by: core-ci <typo3@b13.com>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>