Merge pull request #170 from Azure-Samples/dependabot/pip/marshmallow-3.26.1

Bump marshmallow from 3.23.1 to 3.26.1

Author: pamelafox

src/backend/requirements.txt

@@ -97,7 +97,7 @@ isodate==0.7.2
     # via msrest
 jiter==0.8.0
     # via openai
-marshmallow==3.23.1
+marshmallow==3.26.1
     # via environs
 msal==1.31.1
     # via