fix(conda): fan out noarch builds by cuda-major version

Author: gforsyth

.github/workflows/build.yaml

@@ -41,7 +41,7 @@ jobs:
       date: ${{ inputs.date }}
       script: ci/build_python.sh
       sha: ${{ inputs.sha }}
-      pure-conda: true
+      pure-conda: cuda_major
   upload-conda:
     needs: [build]
     secrets: inherit

.github/workflows/pr.yaml

@@ -30,7 +30,7 @@ jobs:
     with:
       build_type: pull-request
       script: ci/build_python.sh
-      pure-conda: true
+      pure-conda: cuda_major
   test-conda-nightly-env:
     needs: checks
     secrets: inherit