Renaming asv setting build_cache_size (#26703)

Author: datapythonista

asv_bench/asv.conf.json

@@ -107,7 +107,7 @@
     // `asv` will cache wheels of the recent builds in each
     // environment, making them faster to install next time.  This is
     // number of builds to keep, per environment.
-    "wheel_cache_size": 8,
+    "build_cache_size": 8,
 
     // The commits after which the regression search in `asv publish`
     // should start looking for regressions. Dictionary whose keys are