CI: Update Python version for ASVs (#53012)

Author: rhshadrach

asv_bench/asv.conf.json

@@ -29,7 +29,7 @@
 
     // The Pythons you'd like to test against.  If not provided, defaults
     // to the current version of Python used to run `asv`.
-    "pythons": ["3.8"],
+    "pythons": ["3.10"],
 
     // The matrix of dependencies to test.  Each key is the name of a
     // package (in PyPI) and the values are version numbers.  An empty