Update samples/snippets/requirements.txt

Author: leahecole

samples/snippets/requirements.txt

@@ -1,8 +1,8 @@
 google-cloud-bigquery-storage==2.11.0
 google-auth-oauthlib==0.4.6
 grpcio==1.43.0
-ipython==8.0.0; python_version < '3.7'
-ipython==8.0.0; python_version == '3.7'
+ipython==7.16.1; python_version < '3.7'
+ipython==7.31.1; python_version == '3.7'
 ipython==8.0.0; python_version >= '3.8'
 matplotlib==3.5.1; python_version < '3.7'
 matplotlib==3.5.1; python_version >= '3.7'