gnu: python-icalendar: Update to 4.0.3.

* gnu/packages/python.scm (python-icalendar): Update to 4.0.3.

gnu/packages/python.scm

@@ -7475,13 +7475,13 @@ minimal and fast API targeting the following uses:
 (define-public python-icalendar
   (package
     (name "python-icalendar")
-    (version "4.0.1")
+    (version "4.0.3")
     (source (origin
              (method url-fetch)
              (uri (pypi-uri "icalendar" version))
              (sha256
               (base32
-               "139y79y6ijl39m5bj771r43vpah9s4ly7d1k76la6hrx7l144ak8"))))
+               "0mk3dk1dxkcm46jy48v27j2w2349iv4sbimqj1yb5js43mx49hh7"))))
     (build-system python-build-system)
     (propagated-inputs
      `(("python-dateutil" ,python-dateutil)