Bug 1956921 - Update xxHash to version 0.8.3. r=dthayer

Differential Revision: https://phabricator.services.mozilla.com/D243371

mozglue/static/lz4/README.mozilla

@@ -15,4 +15,4 @@ Note that we do NOT use the copy of xxhash.{c,h} from the LZ4 repo. We
 instead use the newer release from that project's upstream repo:
 https://github.com/Cyan4973/xxHash
 
-Current version: 0.8.2 [bbb27a5efb85b92a0486cf361a8635715a53f6ba]
+Current version: 0.8.3 [e626a72bc2321cd320e953a0ccf1584cad60f363]

mozglue/static/lz4/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)
  *
@@ -32,7 +32,6 @@
  *   - xxHash source repository: https://github.com/Cyan4973/xxHash
  */
 
-
 /*
  * xxhash.c instantiates functions defined in xxhash.h
  */