gnu: Remove python-resolvelib@0.5.

* gnu/packages/python-xyz.scm (python-resolvelib-0.5): Delete
variable. This was only used by ansible-core which can now use the
newer version.

Change-Id: Ic40e21561807ed5faae466e13193892e4f9aa6ae
Signed-off-by: Christopher Baines <mail@cbaines.net>

gnu/packages/python-xyz.scm

@@ -13791,22 +13791,6 @@ similar to the Python standard library's @code{json} module.")
 includes dependency resolution logic.")
     (license license:isc)))
 
-;;; This older version is required by ansible-core.
-(define-public python-resolvelib-0.5
-  (package/inherit python-resolvelib
-    (name "python-resolvelib")
-    (version "0.5.4")
-    (source
-     (origin
-       (method git-fetch)
-       (uri (git-reference
-             (url "https://github.com/sarugaku/resolvelib")
-             (commit version)))
-       (file-name (git-file-name name version))
-       (sha256
-        (base32
-         "0697y330sqhiclk25v151qxg7aixzpj434lbg5qib0qlna5zg9la"))))))
-
 (define-public python-commonmark
   (package
     (name "python-commonmark")