[BCB] Remove ConstantArrayType::isEmpty()

Author: ondrejmirtes

UPGRADING.md

@@ -246,3 +246,4 @@ Instead of `PHPStanTestCase::createBroker()`, call `PHPStanTestCase::createRefle
 * Remove `GenericTypeVariableResolver`, use [`Type::getTemplateType()`](https://apiref.phpstan.org/2.0.x/PHPStan.Type.Type.html#_getTemplateType) instead
 * Rename `Type::isClassStringType()` to `Type::isClassString()`
 * Remove `Scope::isSpecified()`, use `hasExpressionType()` instead
+* Remove `ConstantArrayType::isEmpty()`, use `isIterableAtLeastOnce()->no()` instead

src/Type/Constant/ConstantArrayType.php

@@ -136,12 +136,6 @@ public function isConstantValue(): TrinaryLogic
 		return TrinaryLogic::createYes();
 	}
 
-	/** @deprecated Use isIterableAtLeastOnce()->no() instead */
-	public function isEmpty(): bool
-	{
-		return count($this->keyTypes) === 0;
-	}
-
 	/**
 	 * @return non-empty-list<int>
 	 */