[TASK] Update phpstan/phpstan:^1.10.51

New phpstan find some questionable null fallback occurences, that are
not obvious. Add a baseline for now.

> composer req --dev phpstan/phpstan:^1.10.51
> ./Build/Scripts/runTests.sh -s phpstanGenerateBaseline

Resolves: #102756
Releases: main, 12.4
Change-Id: I3eef057d4fd04fe92f813bad7e1873718f6da765
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/82357
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: Stefan Bürk <stefan@buerk.tech>

Build/phpstan/phpstan-baseline.neon

@@ -60,6 +60,11 @@ parameters:
 			count: 1
 			path: ../../typo3/sysext/backend/Classes/Form/Behavior/UpdateValueOnFieldChange.php
 
+		-
+			message: "#^Offset 'onChange' on array\\{label\\: string, config\\: mixed, children\\: mixed, onChange\\: mixed, description\\?\\: mixed\\} in isset\\(\\) always exists and is not nullable\\.$#"
+			count: 1
+			path: ../../typo3/sysext/backend/Classes/Form/Container/FlexFormElementContainer.php
+
 		-
 			message: "#^Offset 'isInlineDefaultLang…' on array on left side of \\?\\? always exists and is not nullable\\.$#"
 			count: 1
@@ -125,6 +130,11 @@ parameters:
 			count: 1
 			path: ../../typo3/sysext/backend/Classes/RecordList/DatabaseRecordList.php
 
+		-
+			message: "#^Variable \\$translations on left side of \\?\\? always exists and is not nullable\\.$#"
+			count: 1
+			path: ../../typo3/sysext/backend/Classes/RecordList/DatabaseRecordList.php
+
 		-
 			message: "#^Method TYPO3\\\\CMS\\\\Backend\\\\Routing\\\\PreviewUriBuilder\\:\\:create\\(\\) should return static\\(TYPO3\\\\CMS\\\\Backend\\\\Routing\\\\PreviewUriBuilder\\) but returns object\\.$#"
 			count: 1
@@ -2950,6 +2960,11 @@ parameters:
 			count: 1
 			path: ../../typo3/sysext/lowlevel/Classes/Controller/DatabaseIntegrityController.php
 
+		-
+			message: "#^Variable \\$var on left side of \\?\\? always exists and is not nullable\\.$#"
+			count: 5
+			path: ../../typo3/sysext/lowlevel/Classes/Controller/DatabaseIntegrityController.php
+
 		-
 			message: "#^Negated boolean expression is always false\\.$#"
 			count: 1

composer.json

@@ -112,7 +112,7 @@
 		"friendsofphp/php-cs-fixer": "^3.46",
 		"friendsoftypo3/phpstan-typo3": "^0.9.0",
 		"php-webdriver/webdriver": "^1.14.0",
-		"phpstan/phpstan": "^1.10.48",
+		"phpstan/phpstan": "^1.10.51",
 		"phpstan/phpstan-phpunit": "^1.3.15",
 		"phpunit/phpunit": "^10.5.5",
 		"sokil/php-isocodes-db-i18n": "^4.0.18",