gnu: Remove python-requests@2.7.

This variable has no dependents anymore.

* gnu/packages/python-web.scm (python-requests-2.7): Remove variable.

gnu/packages/python-web.scm

@@ -1898,18 +1898,6 @@ than Python’s urllib2 library.")
               ("python-idna" ,python-idna-2.7)
               ,@(package-propagated-inputs python-requests)))))
 
-;; Some software requires an older version of Requests, notably Docker
-;; Compose.
-(define-public python-requests-2.7
-  (package (inherit python-requests)
-    (version "2.7.0")
-    (source (origin
-             (method url-fetch)
-             (uri (pypi-uri "requests" version))
-             (sha256
-              (base32
-               "0gdr9dxm24amxpbyqpbh3lbwxc2i42hnqv50sigx568qssv3v2ir"))))))
-
 (define-public python2-requests
   (package-with-python2 python-requests))