chore(deps): update all dependencies (#227)

* chore(deps): update all dependencies

* remove python 2.7 from testing

Co-authored-by: Dina Graves Portman <[email protected]>
Co-authored-by: Anthonios Partheniou <[email protected]>

Author: 3 people

container_registry/container_analysis/snippets/requirements.txt

@@ -1,7 +1,6 @@
 google-cloud-pubsub==2.9.0
 google-cloud-containeranalysis==2.6.2
-grafeas==1.4.0
-pytest==5.3.0; python_version > "3.0"
-pytest==4.6.6; python_version < "3.0"
+grafeas==1.4.1
+pytest==6.2.5
 flaky==3.7.0
 mock==4.0.3