Remove HashContext and dependency

Author: GromNaN

composer.json

@@ -11,7 +11,6 @@
     ],
     "require": {
         "php": "^8.1",
-        "ext-hash": "*",
         "ext-json": "*",
         "ext-mongodb": "^1.20.0",
         "composer-runtime-api": "^2.0",

src/GridFS/WritableStream.php

@@ -17,7 +17,6 @@
 
 namespace MongoDB\GridFS;
 
-use HashContext;
 use MongoDB\BSON\Binary;
 use MongoDB\BSON\ObjectId;
 use MongoDB\BSON\UTCDateTime;
@@ -48,8 +47,6 @@ class WritableStream
 
     private array $file;
 
-    private ?HashContext $hashCtx = null;
-
     private bool $isClosed = false;
 
     private int $length = 0;