Update dependency cffi to v1.15.1

renovate[bot] · web-flow · commit f8d0fb2f3844 · 2022-09-25T14:38:31.000Z
diff --git a/requirements.txt b/requirements.txt
@@ -1,6 +1,6 @@
 cachetools==4.1.1
 certifi==2020.6.20
-cffi==1.14.2
+cffi==1.15.1
 chardet==3.0.4
 google-api-core==1.22.1
 google-auth==1.20.1
