jitsi: fix update scripts

To consistently return the latest version number even when it is no longer
at the bottom of the alphanumeric list on the Jitsi stable download page.
Based on fix by @sbruder in 13760b87d2

pkgs/misc/jitsi-meet-prosody/update.sh

@@ -6,7 +6,7 @@ set -eu -o pipefail
 version="$(curl https://download.jitsi.org/stable/ | \
     pup 'a[href] text{}' | \
     awk -F'[_-]' '/jitsi-meet-prosody/ {printf $4"\n"}' | \
-    sort -u | \
+    sort -Vu | \
     tail -n 1)"
 
 update-source-version jitsi-meet-prosody "$version"

pkgs/servers/jibri/update.sh

@@ -6,7 +6,7 @@ set -eu -o pipefail
 version="$(curl https://download.jitsi.org/stable/ | \
     pup 'a[href] text{}' | \
     awk -F'[_-]' '/jibri/ {printf $2"-"$3"-"$4"\n"}' | \
-    sort -u | \
+    sort -Vu | \
     tail -n 1)"
 
 update-source-version jibri "$version"

pkgs/servers/jicofo/update.sh

@@ -6,7 +6,7 @@ set -eu -o pipefail
 version="$(curl https://download.jitsi.org/stable/ | \
     pup 'a[href] text{}' | \
     awk -F'[_-]' '/jicofo/ {printf $2"-"$3"\n"}' | \
-    sort -u | \
+    sort -Vu | \
     tail -n 1)"
 
 update-source-version jicofo "$version"

pkgs/servers/web-apps/jitsi-meet/update.sh

@@ -6,7 +6,7 @@ set -eu -o pipefail
 version="$(curl https://download.jitsi.org/stable/ | \
     pup 'a[href] text{}' | \
     awk -F'[_-]' '/jitsi-meet-web_/ {printf $4"\n"}' | \
-    sort -u | \
+    sort -Vu | \
     tail -n 1)"
 
 update-source-version jitsi-meet "$version"