Update dependency pyarrow to v0.17.0 [(#3188)](GoogleCloudPlatform/py…

…thon-docs-samples#3188)

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

samples/to_dataframe/requirements.txt

@@ -1,7 +1,7 @@
 google-auth==1.14.0
 google-cloud-bigquery-storage==0.8.0
 google-cloud-bigquery==1.24.0
-pyarrow==0.15.1
+pyarrow==0.17.0
 ipython==7.10.2; python_version > '3.0'
 ipython==5.9.0; python_version < '3.0'
 pandas==0.25.3; python_version > '3.0'