[appengine] chore: remove gcp-devrel-py-tools (#3484)

Takashi Matsuo · web-flow · commit af1f587144e3 · 2020-04-23T14:11:50.000-07:00
fixes #3337 I believe this is the last usage.
diff --git a/appengine/standard/firebase/firetactoe/requirements-test.txt b/appengine/standard/firebase/firetactoe/requirements-test.txt
@@ -1,3 +1,2 @@
 pytest==4.6.9
-gcp-devrel-py-tools==0.0.15
 WebTest==2.0.34
