Try further fixes to circle-ci

Author: matthew-brett

.circleci/config.yml

@@ -3,7 +3,7 @@ version: 2.1
 jobs:
   build:
     docker:
-      - image: cimg/python:3.12
+      - image: cimg/python:3.13
 
     steps:
       - checkout
@@ -16,7 +16,7 @@ jobs:
           name: Install Python dependencies
           command: |
             pip install --upgrade --user pip
-            pip install --user -r requirements.txt
+            pip install --user -r build_requirements.txt
             pip list
 
       - save_cache:
@@ -29,8 +29,7 @@ jobs:
           command: |
             # NOTE: bad interaction w/ blas multithreading on circleci
             export OMP_NUM_THREADS=1
-            make html  # FIX: check that failing examples produce failure
-            cp build/html/_downloads/
+            make web  # FIX: check that failing examples produce failure
 
       - store_artifacts:
-          path: build/html
+          path: _build/html