app-shells/bash: update SRC_URI (prefer GNU mirror for patches)

mirror://gnu first has HTTPS listed so this is a minor
improvement. Of course, we already have Manifests and so on, but ...

(It's listed on https://tiswww.case.edu/php/chet/bash/bashtop.html so
fine to use for patches too.)

Signed-off-by: Sam James <sam@gentoo.org>

app-shells/bash/bash-5.1_p16.ebuild

@@ -27,7 +27,7 @@ patches() {
 		echo "${@/#/${DISTDIR}/}"
 	else
 		local u
-		for u in ftp://ftp.cwru.edu/pub/bash mirror://gnu/${pn} ; do
+		for u in mirror://gnu/${pn} ftp://ftp.cwru.edu/pub/bash ; do
 			printf "${u}/${pn}-${pv}-patches/%s " "$@"
 		done
 	fi