gnu: Add python-marshmallow@3.2.

* gnu/packages/python-xyz.scm (python-marshmallow-3.2): New variable.

Signed-off-by: Tobias Geerinckx-Rice <me@tobias.gr>

gnu/packages/python-xyz.scm

@@ -19168,6 +19168,17 @@ Python datatypes.")
 complex datatypes to and from native Python datatypes.")
     (license license:expat)))
 
+(define-public python-marshmallow-3.2
+  (package
+    (inherit python-marshmallow)
+    (version "3.2.1")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (pypi-uri "marshmallow" version))
+       (sha256
+        (base32 "1w18klwj0z9bqxj252qpj1hz8l46nl27sbc89rkajc7mln73wbws"))))))
+
 (define-public python-apispec
   (package
     (name "python-apispec")