Fix another encoding issue in Doc unit tests (#107453)

build-tools-internal/src/test/groovy/org/elasticsearch/gradle/internal/doc/DocSnippetTaskSpec.groovy

@@ -529,9 +529,11 @@ GET /_analyze
     {
       "type": "mapping",
       "mappings": [
-        "٠ => 0",
-        "١ => 1",
-        "٢ => 2"
+        "e => 0",
+        "m => 1",
+        "p => 2",
+        "t => 3",
+        "y => 4"
       ]
     }
   ],
@@ -551,9 +553,11 @@ GET /_analyze
     {
       "type": "mapping",
       "mappings": [
-        "٠ => 0",
-        "١ => 1",
-        "٢ => 2"
+        "e => 0",
+        "m => 1",
+        "p => 2",
+        "t => 3",
+        "y => 4"
       ]
     }
   ],