projectsmirrors: remove some GNOME mirrors

These removed sites no longer provide GNOME mirror services.

Signed-off-by: Shiji Yang <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/19509
Signed-off-by: Hauke Mehrtens <[email protected]>

scripts/projectsmirrors.json

@@ -56,10 +56,7 @@
 	"@GNOME": [
 		"https://download.gnome.org/sources",
 		"https://mirror.csclub.uwaterloo.ca/gnome/sources",
-		"https://ftp.acc.umu.se/pub/GNOME/sources",
-		"http://ftp.cse.buffalo.edu/pub/Gnome/sources",
-		"http://ftp.nara.wide.ad.jp/pub/X11/GNOME/sources",
-		"https://mirrors.ustc.edu.cn/gnome/sources"
+		"http://ftp.nara.wide.ad.jp/pub/X11/GNOME/sources"
 	],
 	"@OPENWRT": [
 		"https://sources.cdn.openwrt.org",