fix github actions file

.github/workflows/test-and-deploy.yml

@@ -36,15 +36,15 @@ jobs:
         run: |
           python setup.py develop
 
-      - name: pytest
-        run: |
-          pytest GPy/testing
-
       - name: Install test dependencies
         run: |
           pip install matplotlib
           pip install pytest
 
+      - name: pytest
+        run: |
+          pytest GPy/testing
+
   test-linux:
     strategy:
       matrix:
@@ -76,6 +76,7 @@ jobs:
       - name: pytest
         run: |
           pytest GPy/testing
+
   test-macos:
     strategy:
       matrix: