Make code compatible with legacy php versions

Author: smnandre

src/Map/src/Cluster/GridClusteringAlgorithm.php

@@ -30,7 +30,7 @@
  *
  * @author Simon André <[email protected]>
  */
-final readonly class GridClusteringAlgorithm implements ClusteringAlgorithmInterface
+final class GridClusteringAlgorithm implements ClusteringAlgorithmInterface
 {
     /**
      * Clusters a set of points using a fixed grid resolution based on the zoom level.

src/Map/src/Cluster/MortonClusteringAlgorithm.php

@@ -30,7 +30,7 @@
  *
  * @author Simon André <[email protected]>
  */
-final readonly class MortonClusteringAlgorithm implements ClusteringAlgorithmInterface
+final class MortonClusteringAlgorithm implements ClusteringAlgorithmInterface
 {
     /**
      * @param Point[] $points

src/Map/tests/Cluster/ClusteringPerformanceTest.php

@@ -19,13 +19,19 @@
 
 class ClusteringPerformanceTest extends TestCase
 {
-    private const array ZOOMS = [
+    /**
+     * @const array<float>
+     */
+    private const ZOOMS = [
         2.0,
         5.0,
         8.0,
     ];
 
-    private const array ALGORITHMS = [
+    /**
+     * @const array<string>
+     */
+    private const ALGORITHMS = [
         GridClusteringAlgorithm::class,
         MortonClusteringAlgorithm::class,
     ];