DEVELOPERS: drop Gaël Portay

Gaël Portay is apparently no longer at Collabora:

<gael.portay@collabora.com>: host mail.collabora.co.uk[46.235.227.172] said:
    550 5.1.1 <gael.portay@collabora.com>: Recipient address rejected: User
    unknown in local recipient table (in reply to RCPT TO command)

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

DEVELOPERS

@@ -1055,11 +1055,6 @@ F: 	package/elixir/
 F:	package/libmodsecurity/
 F:	package/nginx-modsecurity/
 
-N:	Gaël Portay <gael.portay@collabora.com>
-F:	package/qt5/qt5virtualkeyboard/
-F:	package/qt5/qt5webengine/
-F:	package/qt5/qt5webkit/
-
 N:	Gao Xiang <hsiangkao@aol.com>
 F:	package/erofs-utils/