Update tests.yml

Author: beckermr

.github/workflows/tests.yml

@@ -35,7 +35,7 @@ jobs:
         run: |
           conda install --yes --file=requirements.txt
           conda install --yes pytest flaky pip python-build setuptools_scm>=7 setuptools>=45 toml
-          pip install -e .
+          pip install --no-deps --no-build-isolation -e .
 
       - name: test versions
         shell: bash -el {0}