gnu: Remove python-validictory.

The package has been deprecated in 2018.

* gnu/packages/python-xyz.scm (python-validictory): Delete variable.

gnu/packages/python-xyz.scm

@@ -19153,42 +19153,6 @@ task each process is busy with.  The technique is used by PostgreSQL and the
 OpenSSH Server for example.")
     (license license:bsd-3)))
 
-(define-public python-validictory
-  (package
-    (name "python-validictory")
-    (version "1.0.1")
-    (source
-     (origin
-      (method url-fetch)
-      (uri (pypi-uri "validictory" version))
-      (sha256
-       (base32
-        "1zf1g9sw47xzp5f80bd94pb42j9yqv82lcrgcvdwr6nkaphfi37q"))))
-    (build-system python-build-system)
-    (arguments
-     '(#:phases
-       (modify-phases %standard-phases
-         (add-after 'unpack 'bootstrap
-           ;; Move the tests out of the package directory to avoid
-           ;; packaging them.
-           (lambda* _
-             (rename-file "validictory/tests" "tests")
-             (delete-file "tests/__init__.py")))
-         (replace 'check
-           (lambda _
-             (invoke "py.test" "-vv" ))))))
-    (native-inputs
-     (list python-pytest))
-    (home-page
-     "https://github.com/jamesturk/validictory")
-    (synopsis "General purpose Python data validator")
-    (description "It allows validation of arbitrary Python data structures.
-
-     The schema format is based on the JSON Schema
-     proposal (http://json-schema.org), so combined with json the library is also
-     useful as a validator for JSON data.")
-  (license license:expat)))
-
 (define-public python-pyelftools
   (package
     (name "python-pyelftools")