[TASK] Update pear/http_request2 dependency to version 2.3.0

Updates the mentioned dependency and accommodates new
differences in "include-paths" setting which is now included
directly from within the dependency. Preserving the previous
"include-path" setting breaks the inclusion completely.

NB: Must be followed up with patch to documentation download
which after this change will be incapable of downloading https
urls (e.g. zip files with documentation).

Change-Id: Ib06f44e6e1283aa6d5eb1dc0254005ef0eeb3f62
Resolves: #67838
Releases: 7.6
Reviewed-on: https://review.typo3.org/48692


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>
Reviewed-by: Andreas Fernandez <typo3@scripting-base.de>
Tested-by: Andreas Fernandez <typo3@scripting-base.de>