[stable18] [stable20] dont use system composer for autoload checker

[backportbot-nextcloud]

backport of #24557

[faily-bot]

🤖 beep boop beep 🤖

Here are the logs for the failed build:

Status of 212: failure

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• I'm a little sad 🤖 and was not able to find the logs for this failed job - please improve me at https://github.com/MorrisJobke/drone-logs to provide this to you

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Show full log

There was 1 error:

1) OCA\Files_Sharing\Tests\ApiTest::testGetShareFromFileReReShares
Error: Call to a member function getMountPoint() on null

/drone/src/lib/private/Share20/Manager.php:305
/drone/src/lib/private/Share20/Manager.php:707
/drone/src/apps/files_sharing/tests/ApiTest.php:889

--

There were 2 warnings:

1) Test\Files\ViewTest::testRenameFailDeleteTargetKeepSource
Trying to configure method "writeStream" which cannot be configured because it does not exist, has not been specified, is final, or is static

2) Test\Files\ViewTest::testCopyFailDeleteTargetKeepSource
Trying to configure method "writeStream" which cannot be configured because it does not exist, has not been specified, is final, or is static