ci: Place upper bound on min supported setuptools (#2479)

* Place an upper bound on setuptools of <70.0.0 for the 'minimum supported
  dependencies' workflow as setuptools v70.0.0 reduces pkg_resources
  useage.
   - Avoids a "cannot import name 'packaging' from 'pkg_resources'" ImportError
     caused by PyTorch.
   - c.f. https://setuptools.pypa.io/en/latest/pkg_resources.html

Author: matthewfeickert

.github/workflows/lower-bound-requirements.yml

@@ -27,7 +27,7 @@ jobs:
     - name: Install dependencies and force lowest bound
       run: |
         python -m pip install uv
-        uv pip install --system --upgrade pip setuptools wheel
+        uv pip install --system --upgrade pip 'setuptools<70.0.0' wheel
         uv pip --no-cache install --system --constraint tests/constraints.txt ".[all,test]"
 
     - name: List installed Python packages