chore(deps): update dependency backoff to v2.1.2 (#811)

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

Author: 3 people

storage/samples/snippets/requirements-test.txt

@@ -1,3 +1,3 @@
 pytest==7.1.2
 mock==4.0.3
-backoff==2.1.0
+backoff==2.1.2