chore(deps): update dependency pandas-gbq to v0.28.0 (#884)

Author: renovate-bot

samples/snippets/requirements.txt

@@ -1,6 +1,6 @@
 google-cloud-bigquery-storage==2.28.0
 google-cloud-bigquery==3.29.0
-pandas-gbq==0.27.0
+pandas-gbq==0.28.0
 pandas===2.0.3; python_version == '3.8'
 pandas==2.2.3; python_version >= '3.9'
 pyarrow==19.0.1; python_version >= '3.9'