Update xxhash

subprojects/xxhash.wrap

 [wrap-file]
-directory = xxHash-0.8.0
-source_url = https://github.com/Cyan4973/xxHash/archive/v0.8.0.tar.gz
-source_filename = xxHash-0.8.0.tar.gz
-source_hash = 7054c3ebd169c97b64a92d7b994ab63c70dd53a06974f1f630ab782c28db0f4f
-patch_filename = xxhash_0.8.0-2_patch.zip
-patch_url = https://wrapdb.mesonbuild.com/v2/xxhash_0.8.0-2/get_patch
-patch_hash = 793101300da5d24b7341e6b9e9e39e57e73cf1858aba6fef86adb54a7e9d58c8
+directory = xxHash-0.8.1
+source_url = https://github.com/Cyan4973/xxHash/archive/v0.8.1.tar.gz
+source_filename = xxHash-0.8.1.tar.gz
+source_hash = 3bb6b7d6f30c591dd65aaaff1c8b7a5b94d81687998ca9400082c739a690436c
+patch_filename = xxhash_0.8.1-2_patch.zip
+patch_url = https://wrapdb.mesonbuild.com/v2/xxhash_0.8.1-2/get_patch
+patch_hash = a1f4de52082b2bd06d5fccb4d40b755470b3a62bfab4262d47b24b361d4b8ba3
+wrapdb_version = 0.8.1-2
 
 [provide]
 libxxhash = xxhash_dep
-