Upgrade pandas in BQ samples lagging in python 3.10 (GoogleCloudPlatform#7190)

* Upgrade pandas

* upgrade pandas

Author: leahecole

bigquery/bqml/requirements.txt

@@ -1,7 +1,7 @@
 google-cloud-bigquery[pandas,bqstorage]==2.30.1
 google-cloud-bigquery-storage==2.10.1
 pandas==1.1.5; python_version < '3.7'
-pandas==1.2.0; python_version > '3.6'
+pandas==1.3.4; python_version > '3.6'
 pyarrow==6.0.1
 flaky==3.7.0
 mock==4.0.3

bigquery/pandas-gbq-migration/requirements.txt

@@ -1,7 +1,7 @@
 google-cloud-bigquery==2.30.1
 google-cloud-bigquery-storage==2.10.1
 pandas==1.1.5; python_version < '3.7'
-pandas==1.2.4; python_version > '3.6'
+pandas==1.3.4; python_version > '3.6'
 pandas-gbq==0.15.0; python_version > '3.6'
 pandas-gbq==0.14.1; python_version < '3.7'
 pyarrow==6.0.1