chore(deps): update dependency pandas to v2.1.4 (#1198)

Author: renovate-bot

samples/snippets/requirements.txt

@@ -2,4 +2,4 @@ google-cloud-pubsub==2.18.4
 google-cloud-storage==2.13.0
 pandas===1.3.5; python_version == '3.7'
 pandas===2.0.3; python_version == '3.8'
-pandas==2.1.3; python_version >= '3.9'
+pandas==2.1.4; python_version >= '3.9'