Benjamin Franzke authored Feb 23, 2021 and Georg Ringer committed Mar 10, 2021

Back when the PSR-18 implementation was added in #89216 we
promised to replace our PSR-18 client wrapper once Guzzle
supports PSR-18 natively.
The intention was to point our dependency injection (DI)
alias configuration for the PSR-18 client interface to
guzzles native implementation once available.

Due to the major Guzzle update (to v7) in #92995, the PSR-18
interface implementation became available and therefore
the previous client wrapper is now dropped and DI
configuration is adapted accordingly.

We keep the existing unit tests to verify compatibility
between GuzzleHTTP client and our PSR-7 request stack.

`provide.psr/http-client-implementation` is dropped from
composer.json as this is now set by guzzlehttp/guzzle.

Resolves: #93573
Related: #89216
Related: #92995
Releases: master
Change-Id: Idcdf2e429019c60c14e93e954cd9fa45c6c57fbf
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/68057


Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: cor...