[RELEASE] 13.1.2

[dkd-kaehm]

This is a bugfix release for TYPO3 13 LTS, primarily restoring Solr write functionality after a regression introduced by an upstream PSR-7 library update.

Highlights since 13.1.1:

• [BUGFIX] Pin guzzlehttp/psr7 to <2.10.0 — guzzlehttp/psr7 2.10.0 changed Utils::modifyRequest() to mutate the original RequestInterface via withHeader() instead of rebuilding a Guzzle Request. Combined with Guzzle's PrepareBodyMiddleware passing Content-Length as an int, this broke all Solr write requests through Solarium's Psr18Adapter in spec-compliant PSR-7 implementations like TYPO3\CMS\Core\Http\Message ([BUG] Solr writes fail with "Invalid header value for Content-Length" after guzzlehttp/psr7 2.10.0 #4660 / @dkd-kaehm)
• [BUGFIX] Prevent c:0 variant and content leakage on fe_group-restricted pages ([BUGFIX:13.1] Prevent c:0 variant and content leakage on fe_group-restricted pages #4641 / @dkd-kaehm)
• Plus 10 additional bugfixes and maintenance updates — see release notes for details.

Please read the release notes:

• https://docs.typo3.org/p/apache-solr-for-typo3/solr/13.1/en-us/Releases/solr-release-13-1.html
• https://github.com/TYPO3-Solr/ext-solr/releases/tag/13.1.2

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Relates: #4660