Update xxhash to v0.8.3

Author: halx99

3rdparty/README.md

@@ -244,7 +244,7 @@
 
 ## xxHash
 - [![Upstream](https://img.shields.io/github/v/release/Cyan4973/xxHash?label=Upstream)](https://github.com/Cyan4973/xxHash)
-- Version: 0.8.2
+- Version: 0.8.3
 - License: BSD-2-Clause
 
 ## yaml-cpp

3rdparty/xxhash/xxhash.c

@@ -1,6 +1,6 @@
 /*
  * xxHash - Extremely Fast Hash algorithm
- * Copyright (C) 2012-2021 Yann Collet
+ * Copyright (C) 2012-2023 Yann Collet
  *
  * BSD 2-Clause License (https://www.opensource.org/licenses/bsd-license.php)
  *
@@ -32,12 +32,11 @@
  *   - xxHash source repository: https://github.com/Cyan4973/xxHash
  */
 
-
 /*
  * xxhash.c instantiates functions defined in xxhash.h
  */
 
-#define XXH_STATIC_LINKING_ONLY   /* access advanced declarations */
-#define XXH_IMPLEMENTATION   /* access definitions */
+#define XXH_STATIC_LINKING_ONLY /* access advanced declarations */
+#define XXH_IMPLEMENTATION      /* access definitions */
 
 #include "xxhash.h"