re-add pooch to benchmark deps

Author: flying-sheep

benchmarks/asv.conf.json

@@ -70,7 +70,9 @@
     // pip (with all the conda available packages installed first,
     // followed by the pip installed packages).
     //
-    "matrix": {},
+    "matrix": {
+        "pooch": [""],
+    },
 
     // Combinations of libraries/python versions can be excluded/included
     // from the set to test. Each entry is a dictionary containing additional