fix: remove mamba backend for asv

.github/workflows/benchmark.yml

@@ -46,12 +46,10 @@ jobs:
           environment-name: asv
           cache-environment: true
           # Deps documented in https://asv.readthedocs.io/en/latest/installing.html
-          # libmambapy upper bound: https://github.com/airspeed-velocity/asv/issues/1438
-          # asv upper bound https://github.com/scverse/anndata/pull/2129
           create-args: >-
             python=${{ matrix.python }}
-            asv<0.6.5
-            libmambapy<2
+            asv
+            py_rattler
             conda-build
 
       - name: Cache datasets

benchmarks/asv.conf.json

@@ -36,7 +36,7 @@
     // If missing or the empty string, the tool will be automatically
     // determined by looking for tools on the PATH environment
     // variable.
-    "environment_type": "mamba",
+    "environment_type": "rattler",
     // timeout in seconds for installing any dependencies in environment
     // defaults to 10 min
     //"install_timeout": 600,