ChunkUtils: fixed phpstan level 7 type inference error

src/pocketmine/level/format/io/ChunkUtils.php

@@ -98,6 +98,7 @@ if(!extension_loaded('pocketmine_chunkutils')){
 		 * Converts pre-MCPE-1.0 biome color array to biome ID array.
 		 *
 		 * @param int[] $array of biome color values
+		 * @phpstan-param array<int, int> $array
 		 */
 		public static function convertBiomeColors(array $array) : string{
 			$result = str_repeat("\x00", 256);

tests/phpstan/configs/l7-baseline.neon

@@ -725,11 +725,6 @@ parameters:
 			count: 1
 			path: ../../../src/pocketmine/level/format/Chunk.php
 
-		-
-			message: "#^Method pocketmine\\\\level\\\\format\\\\io\\\\ChunkUtils\\:\\:convertBiomeColors\\(\\) should return string but returns array\\<string\\>\\|string\\.$#"
-			count: 1
-			path: ../../../src/pocketmine/level/format/io/ChunkUtils.php
-
 		-
 			message: "#^Parameter \\#1 \\$string of function strlen expects string, string\\|false given\\.$#"
 			count: 2