gnu: Add python-types-dataclasses.

* gnu/packages/python-xyz.scm (python-types-dataclasses): New variable.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

gnu/packages/python-xyz.scm

@@ -28903,3 +28903,21 @@ (define-public python-esprima
       "This package provides ECMAScript parsing infrastructure for
 multipurpose analysis in Python.")
     (license license:bsd-3)))
+
+(define-public python-types-dataclasses
+  (package
+    (name "python-types-dataclasses")
+    (version "0.6.1")
+    (source (origin
+              (method url-fetch)
+              (uri (pypi-uri "types-dataclasses" version))
+              (sha256
+               (base32
+                "1mq6qd365m8ml889zl5dxj9kncjv71iq1d1fvgj59y0ixlpm6s35"))))
+    (build-system python-build-system)
+    (home-page "https://github.com/python/typeshed")
+    (synopsis "Typing stubs for dataclasses")
+    (description
+     "This packages provides a collection of library stubs for Python, with
+static types.")
+    (license license:asl2.0)))