Auto-update dependencies. [(googleapis#1055)](GoogleCloudPlatform/python-docs-samples#1055)

* Auto-update dependencies.

* Explicitly use latest bigtable client

Change-Id: Id71e9e768f020730e4ca9514a0d7ebaa794e7d9e

* Revert language update for now

Change-Id: I8867f154e9a5aae00d0047c9caf880e5e8f50c53

* Remove pdb. smh

Change-Id: I5ff905fadc026eebbcd45512d4e76e003e3b2b43

Author: dpebot

samples/hello/requirements.txt

@@ -1,2 +1,2 @@
-google-cloud-bigtable==0.25.0
-google-cloud-core==0.25.0
+google-cloud-bigtable==0.26.0
+google-cloud-core==0.26.0