Fixed command for caceh (there is no neos. prefix)

Author: bastianschwarz

src/task/cache/Flush.php

@@ -22,7 +22,7 @@ public function __construct(public bool         $force = false,
   }
 
   public function getCommand() : string {
-    return 'neos.flow:cache:flush';
+    return 'flow:cache:flush';
   }
 
   public function getArguments() : array {

test/task/cache/FlushTest.php

@@ -52,6 +52,6 @@ public function testGetArguments_withForce() : void {
   }
 
   public function testGetCommand() : void {
-    self::assertEquals('neos.flow:cache:flush', $this->sut->getCommand());
+    self::assertEquals('flow:cache:flush', $this->sut->getCommand());
   }
 }