Fix test reporting git merge-base (#65787)

diff --git a/tools/stats/print_test_stats.py b/tools/stats/print_test_stats.py
index 8c1f797..7c21491 100755 (executable)
--- a/tools/stats/print_test_stats.py
+++ b/tools/stats/print_test_stats.py
@@ -108,7 +108,7 @@ def plural(n: int) -> str:
 
 def get_base_commit(sha1: str) -> str:
     return subprocess.check_output(
-        ["git", "merge-base", sha1, "origin/master"],
+        ["git", "merge-base", sha1, "origin/release/1.10"],
         encoding="ascii",
     ).strip()