Add supported branch chrome/m125, remove chrome/m121

Change-Id: I3eee1f62fb7d293a508fd5e8d2b015ee08cc06ea
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/841201
Reviewed-by: Heather Miller <hcm@google.com>
diff --git a/supported-branches.json b/supported-branches.json
index f9960fa..5f483dc 100644
--- a/supported-branches.json
+++ b/supported-branches.json
@@ -9,10 +9,6 @@
       "owner": "djsollen@google.com"
     },
     {
-      "ref": "refs/heads/chrome/m121",
-      "owner": "sharaks@google.com"
-    },
-    {
       "ref": "refs/heads/chrome/m122",
       "owner": "sharaks@google.com"
     },
@@ -23,6 +19,10 @@
     {
       "ref": "refs/heads/chrome/m124",
       "owner": "sharaks@google.com"
+    },
+    {
+      "ref": "refs/heads/chrome/m125",
+      "owner": "sharaks@google.com"
     }
   ]
 }
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