chore(deps): update dependency pandas to v1.3.4 (#648)

* chore(deps): update dependency pandas to v1.3.4

* Update samples/snippets/requirements.txt

Co-authored-by: Leah E. Cole <6719667+leahecole@users.noreply.github.com>

Author: renovate-bot

samples/snippets/requirements.txt

@@ -1,3 +1,4 @@
 google-cloud-pubsub==2.9.0
 google-cloud-storage==1.42.3
-pandas==1.1.5
+pandas==1.3.4; python_version > '3.6'
+pandas==1.1.5; python_version < '3.7'