[TASK] Update phpstan and adjust baseline

Used command(s):

> composer require --dev \
    "phpstan/phpstan":"^1.12.5" \
    "phpstan/phpstan-phpunit":"^1.4.0"
> Build/Scripts/runTests.sh -s phpstanGenerateBaseline

Author: sbuerk

Build/phpstan/phpstan-baseline.neon

@@ -31,8 +31,13 @@ parameters:
 			path: ../../Classes/Composer/ExtensionTestEnvironment.php
 
 		-
-			message: "#^Strict comparison using \\=\\=\\= between class\\-string\\<T of object\\> and '' will always evaluate to false\\.$#"
-			count: 2
+			message: "#^Strict comparison using \\=\\=\\= between class\\-string\\<T of object \\(method TYPO3\\\\TestingFramework\\\\Core\\\\BaseTestCase\\:\\:getAccessibleMock\\(\\), argument\\)\\> and '' will always evaluate to false\\.$#"
+			count: 1
+			path: ../../Classes/Core/BaseTestCase.php
+
+		-
+			message: "#^Strict comparison using \\=\\=\\= between class\\-string\\<T of object \\(method TYPO3\\\\TestingFramework\\\\Core\\\\BaseTestCase\\:\\:getAccessibleMockForAbstractClass\\(\\), argument\\)\\> and '' will always evaluate to false\\.$#"
+			count: 1
 			path: ../../Classes/Core/BaseTestCase.php
 
 		-

composer.json

@@ -66,8 +66,8 @@
   },
   "require-dev": {
     "friendsofphp/php-cs-fixer": "^3.4.0",
-    "phpstan/phpstan": "^1.8.0",
-    "phpstan/phpstan-phpunit": "^1.1.1",
+    "phpstan/phpstan": "^1.12.5",
+    "phpstan/phpstan-phpunit": "^1.4.0",
     "typo3/cms-workspaces": "10.*.*@dev || 11.*.*@dev"
   }
 }