Fix PHP 8.0 build

Author: ondrejmirtes

build/readonly-property.neon

@@ -1,3 +1,16 @@
 parameters:
 	excludePaths:
 		- ../tests/PHPStan/Rules/Properties/MissingReadOnlyPropertyAssignRuleTest.php
+
+	ignoreErrors:
+		-
+			rawMessage: Result of && is always false.
+			identifier: booleanAnd.alwaysFalse
+			count: 1
+			path: ../tests/PHPStan/Rules/Properties/MissingReadOnlyPropertyAssignRuleWithoutNarrowMethodScopeTest.php
+
+		-
+			rawMessage: 'Strict comparison using === between class-string and ''MissingReadOnlyPropertyAssign\\Entity'' will always evaluate to false.'
+			identifier: identical.alwaysFalse
+			count: 1
+			path: ../tests/PHPStan/Rules/Properties/MissingReadOnlyPropertyAssignRuleWithoutNarrowMethodScopeTest.php