gnu: Remove python-contexttimer.

The latest release was in 2016, no actively developed, depends on
outdated inputs, has no users in Guix.

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

Change-Id: I35ceb328a511854cb10c6a126aacf88f06a5d4b8

gnu/packages/python-xyz.scm

@@ -20181,29 +20181,6 @@ and dataclasses.")
 @code{ArgumentParser} object.")
     (license license:asl2.0)))
 
-(define-public python-contexttimer
-  (package
-    (name "python-contexttimer")
-    (version "0.3.3")
-    (source
-     (origin
-       (method git-fetch)
-       (uri (git-reference
-             (url "https://github.com/brouberol/contexttimer")
-             (commit (string-append "v" version))))
-       (file-name (git-file-name name version))
-       (sha256
-        (base32 "00a9h06a1wj66935n863qlk4jpl9gvdvzkkhl8xmgqwdkwv0js54"))))
-    (build-system pyproject-build-system)
-    (propagated-inputs (list python-decorator python-unittest2))
-    (native-inputs (list python-mock python-setuptools python-wheel))
-    (home-page "https://github.com/brouberol/contexttimer")
-    (synopsis "Timer as a context manager")
-    (description
-     "This package offers utilities to measure code block or function
-execution time.")
-    (license license:gpl3)))
-
 (define-public python-texttable
   (package
     (name "python-texttable")