librsvg: update to 2.50.7.

librsvg 2.52.0 has changes to default values, so hold off on updating to
it for now.

srcpkgs/librsvg/template

@@ -1,6 +1,6 @@
 # Template file for 'librsvg'
 pkgname=librsvg
-version=2.50.3
+version=2.50.7
 revision=1
 build_style=gnu-configure
 build_helper="gir"
@@ -15,7 +15,7 @@ homepage="https://wiki.gnome.org/Projects/LibRsvg"
 # update changelog when release series changes
 changelog="https://gitlab.gnome.org/GNOME/librsvg/-/raw/librsvg-2.50/NEWS"
 distfiles="${GNOME_SITE}/${pkgname}/${version%.*}/${pkgname}-${version}.tar.xz"
-checksum=a4298a98e3a95fdd73c858c17d4dd018525fb09dbb13bbd668a0c2243989e958
+checksum=fffb61b08cd5282aaae147a02b305166a7426fad22a8b9427708f0f2fc426ebc
 
 do_check() {
 	# reference files are for specific pango and harfbuzz versions