Bump grpcio from 1.38.0 to 1.38.1 in /tests (#1689)

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

tests/requirements.txt

@@ -12,5 +12,5 @@ pytest-html==3.1.1
 pytest-profiling==1.7.0
 more-itertools==8.8.0
 mock==4.0.3
-grpcio==1.38.0
+grpcio==1.38.1
 grpcio-tools==1.38.0