[BCB] Remove ConstantArrayType::removeFirst()

Author: ondrejmirtes

UPGRADING.md

@@ -253,6 +253,7 @@ Instead of `PHPStanTestCase::createBroker()`, call `PHPStanTestCase::createRefle
 * Remove `ConstantArrayType::generalizeToArray()`
 * Remove `ConstantArrayType::findTypeAndMethodName()`, use `findTypeAndMethodNames()` instead
 * Remove `ConstantArrayType::removeLast()`, use [`Type::popArray()`](https://apiref.phpstan.org/2.0.x/PHPStan.Type.Type.html#_popArray) instead
+* Remove `ConstantArrayType::removeFirst()`, use [`Type::shiftArray()`](https://apiref.phpstan.org/2.0.x/PHPStan.Type.Type.html#_shiftArray) instead
 * Made `TypeUtils` thinner by removing methods:
   * Remove `TypeUtils::getArrays()` and `getAnyArrays()`, use [`Type::getArrays()`](https://apiref.phpstan.org/2.0.x/PHPStan.Type.Type.html#_getArrays) instead
   * Remove `TypeUtils::getConstantArrays()` and `getOldConstantArrays()`, use [`Type::getConstantArrays()`](https://apiref.phpstan.org/2.0.x/PHPStan.Type.Type.html#_getConstantArrays) instead

src/Type/Constant/ConstantArrayType.php

@@ -1034,12 +1034,6 @@ private function removeLastElements(int $length): self
 		);
 	}
 
-	/** @deprecated Use shiftArray() instead */
-	public function removeFirst(): self
-	{
-		return $this->removeFirstElements(1);
-	}
-
 	/** @param positive-int $length */
 	private function removeFirstElements(int $length, bool $reindex = true): self
 	{