Update language-data from upstream

Add Saaroa (sxr)

Updating to
wikimedia/language-data@a8ca74c

Author: ToluAyo

src/jquery.uls.data.js

@@ -4929,6 +4929,13 @@
         "swh": [
             "sw"
         ],
+        "sxr": [
+            "Latn",
+            [
+                "AS"
+            ],
+            "Hla'alua"
+        ],
         "sxu": [
             "Latn",
             [
@@ -5237,6 +5244,13 @@
             ],
             "Sinūg"
         ],
+        "tsu": [
+            "Latn",
+            [
+                "AS"
+            ],
+            "cou"
+        ],
         "tt": [
             "Cyrl",
             [