chore(deps): bump boto dependency

(cherry picked from commit 821a4df192)

pyproject.toml

@@ -74,7 +74,7 @@ dependencies = [
     "markdownify~=0.11.2",
 
     # integration dependencies
-    "boto3~=1.17.53",
+    "boto3~=1.18.49",
     "dropbox~=11.7.0",
     "google-api-python-client~=2.2.0",
     "google-auth-httplib2~=0.1.0",