Fix or update various overrides in Gir.toml

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer-rs/-/merge_requests/1435>

gstreamer-audio/Gir.toml

@@ -327,6 +327,10 @@ status = "generate"
     # Platform dependant
     manual = true
 
+    [[object.member]]
+    name = "last"
+    ignore = true
+
     [[object.function]]
     name = "to_string"
     # This has an Unknown field that may return NULL or "UNKNOWN"

gstreamer-net/Gir.toml

@@ -61,10 +61,5 @@ final_type = true
     name = "new"
         [[object.function.parameter]]
         name = "name"
-        # See https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/6251
-        nullable = true
-
         [object.function.return]
-        # See https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/6251
-        nullable = true
         nullable_return_is_error = "Can't create gst::PtpClock"

gstreamer-pbutils/Gir.toml

@@ -359,6 +359,13 @@ status = "generate"
         [object.function.return]
         nullable_return_is_error = "Failed to create EncodingProfile from DiscovererInfo"
 
+    [[object.function]]
+    name = "from_string"
+        [object.function.return]
+        # https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/6775
+        nullable = true
+        nullable_return_is_error = "Failed to create EncodingProfile from string"
+
 [[object]]
 name = "GstPbutils.EncodingTarget"
 status = "generate"

gstreamer-video/Gir.toml

@@ -202,6 +202,10 @@ status = "generate"
     name = "event_new_touch_frame"
     manual = true
 
+    [[object.function]]
+    name = "event_new_mouse_double_click"
+    manual = true
+
     [[object.function]]
     name = "event_new_touch_cancel"
     manual = true
@@ -649,6 +653,10 @@ status = "generate"
     name = "y412_le"
     version = "1.18"
 
+    [[object.member]]
+    name = "last"
+    ignore = true
+
     [[object.function]]
     name = "to_string"
     # This has an Unknown field that may return NULL or "UNKNOWN"