Merge pull request #1997 from jupyterhub/dependabot/pip/images/hub/py…

…-spy-0.3.4

build(deps): bump py-spy from 0.3.3 to 0.3.4 in /images/hub

images/hub/requirements.txt

@@ -43,7 +43,7 @@ onetimepass==1.0.1        # via jupyterhub-nativeauthenticator
 pamela==1.0.0             # via jupyterhub
 prometheus-client==0.9.0  # via jupyterhub
 psycopg2-binary==2.8.6    # via -r requirements.in
-py-spy==0.3.3             # via -r requirements.in
+py-spy==0.3.4             # via -r requirements.in
 pyasn1-modules==0.2.8     # via google-auth
 pyasn1==0.4.8             # via ldap3, pyasn1-modules, rsa
 pycparser==2.20           # via cffi