bpo-36546: No longer a need to make "data" positional only (GH-16252) (GH-16253)

(cherry picked from commit 272d0d017aef585acf84bb0af99a90a2a8582b2c)

Co-authored-by: Raymond Hettinger <rhettinger@users.noreply.github.com>
diff --git a/Lib/statistics.py b/Lib/statistics.py
index 70c48d6..d81596e 100644
--- a/Lib/statistics.py
+++ b/Lib/statistics.py
@@ -615,7 +615,7 @@
 # position is that fewer options make for easier choices and that
 # external packages can be used for anything more advanced.
 
-def quantiles(data, /, *, n=4, method='exclusive'):
+def quantiles(data, *, n=4, method='exclusive'):
     """Divide *data* into *n* continuous intervals with equal probability.
 
     Returns a list of (n - 1) cut points separating the intervals.