[vala/staging] webkit2gtk-4.0: Update to 2.31.91

[Rico Tzschichholz <ricotz src gnome org>]

commit 95ed08db004e26730bfb74cf9da8592580a2df00
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Mon Mar 15 14:53:39 2021 +0100

    webkit2gtk-4.0: Update to 2.31.91

 vapi/webkit2gtk-4.0.vapi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/vapi/webkit2gtk-4.0.vapi b/vapi/webkit2gtk-4.0.vapi
index 8f8bc6212..a7616e387 100644
--- a/vapi/webkit2gtk-4.0.vapi
+++ b/vapi/webkit2gtk-4.0.vapi
@@ -743,7 +743,7 @@ namespace WebKit {
                public uint16 get_port ();
                [Version (since = "2.16")]
                public unowned string? get_protocol ();
-               [Version (since = "2.16")]
+               [Version (deprecated = true, deprecated_since = "2.32", since = "2.16")]
                public bool is_opaque ();
                [Version (since = "2.16")]
                public unowned WebKit.SecurityOrigin @ref ();