gnu: python-pygobject: Update to 3.50.0.

* gnu/packages/glib.scm (python-pygobject): Update to 3.50.0.
(python-pygobject-3.48): Delete variable.
* gnu/packages/gstreamer.scm (python-gst): Adjust accordingly.

gnu/packages/glib.scm

@@ -1063,7 +1063,7 @@ useful for C++.")
 (define-public python-pygobject
   (package
     (name "python-pygobject")
-    (version "3.47.0")
+    (version "3.50.0")
     (source
      (origin
        (method url-fetch)
@@ -1072,7 +1072,7 @@ useful for C++.")
                            "/pygobject-" version ".tar.xz"))
        (sha256
         (base32
-         "082dpm34a350bnhgmkdv8myxzjgnrflckkpn46vnvs36f7bbfdij"))
+         "04i28xrb9fxkmn9j2mmsl0lbmk9blgjcl8hnxrbx90d8nmsnx0wd"))
        (modules '((guix build utils)))
        (snippet
         ;; We disable these tests in a snippet so that they are inherited
@@ -1112,20 +1112,6 @@ useful for C++.")
      '((upstream-name . "pygobject")))
     (license license:lgpl2.1+)))
 
-(define-public python-pygobject-3.48
-  (package
-    (inherit python-pygobject)
-    (version "3.48.2")
-    (source
-     (origin
-       (inherit (package-source python-pygobject))
-       (uri (string-append "mirror://gnome/sources/pygobject/"
-                           (version-major+minor version)
-                           "/pygobject-" version ".tar.xz"))
-       (sha256
-        (base32
-         "19yii8lydnjw225k4gclhn8hya7caiginqi0mj9a0cdym6sax507"))))))
-
 (define-public perl-glib
   (package
     (name "perl-glib")

gnu/packages/gstreamer.scm

@@ -1130,7 +1130,7 @@ binary, but none of the actual plugins.")))
     (native-inputs
      (list pkg-config python))
     (propagated-inputs
-     (list gst-plugins-base python-pygobject-3.48))
+     (list gst-plugins-base python-pygobject))
     (home-page "https://gstreamer.freedesktop.org/")
     (synopsis "GStreamer GObject Introspection overrides for Python")
     (description