Fold hypothesis install into the previous pip install.

This will avoid installing one version of `hypothesis` and then replacing it;
installing the right version from the get-go. It will therefore bring down
the time required to initialize the environment.

Author: hameerabbasi

.github/workflows/ci.yml

@@ -109,8 +109,7 @@ jobs:
         cache: 'pip'
     - name: Install build and test dependencies from PyPI
       run: |
-        pip install pytest-xdist -r "$ARRAY_API_TESTS_DIR/requirements.txt"
-        pip install hypothesis==6.131.0
+        pip install pytest-xdist hypothesis==6.131.0 -r "$ARRAY_API_TESTS_DIR/requirements.txt"
     - name: Build and install Sparse
       run: |
         pip install -U setuptools wheel