gnu: scvelo: Make compatible with latest matplotlib.

* gnu/packages/bioinformatics.scm (scvelo)[arguments]: Add phase
'matplotlib-compatibility.

Change-Id: Ia761821c8aa1e516525cff7c680db471a5908e5f

gnu/packages/bioinformatics.scm

@@ -20799,6 +20799,11 @@ aligner.")
        '(list "-k" "not test_perfect_fit and not test_perfect_fit_2d")
        #:phases
        #~(modify-phases %standard-phases
+           (add-after 'unpack 'matplotlib-compatibility
+             (lambda _
+               (substitute* "scvelo/settings.py"
+                 (("warnings.filterwarnings\\(\"ignore\", category=cbook.mplDeprecation\\)")
+                  ""))))
            ;; Numba needs a writable dir to cache functions.
            (add-before 'check 'set-numba-cache-dir
              (lambda _