chore(deps): update dependency pandas to v1.1.5 (#417)

Co-authored-by: Tim Swast <swast@google.com>

Author: renovate-bot

samples/snippets/requirements.txt

@@ -5,6 +5,6 @@ grpcio==1.34.0
 ipython==7.16.1; python_version < '3.7'
 ipython==7.17.0; python_version >= '3.7'
 matplotlib==3.3.3
-pandas==1.1.4
+pandas==1.1.5
 pyarrow==2.0.0
 pytz==2020.4