[BUGFIX] Ensure composer update --prefer-lowest installs the lowest p…

…ossible packages

Since the change of platform.php in the composer.json to 7.2.5 according
to Symfony 5.x composer does not install the lowest dependencies for
sure. This patch enforces the change of the platform before running
composer update --prefer-lowest

Resolves: #92251
Releases: master, 10.4, 9.5
Change-Id: I6b0fce76a2995c39215caf04d355154c87cfe3fe
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/65722
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>

Build/bamboo/src/main/java/core/AbstractCoreSpec.java

@@ -1764,6 +1764,7 @@ Task getTaskComposerUpdateMin(String requirementIdentifier) {
                 this.getScriptTaskBashInlineBody() +
                     this.getScriptTaskComposer(requirementIdentifier) +
                     "composer install -n\n" +
+                    "composer config platform.php 7.2.0\n" +
                     "composer update --prefer-lowest --no-progress  -n\n" +
                     "composer dumpautoload"
             )