feat: update downloads for 22.04 from 22.04.4 to 22.04.5 (#179)

According to:

https://discourse.ubuntu.com/t/jammy-jellyfish-22-04-5-lts-point-release-status-tracking/47722/1

... Ubuntu 22.04.5 LTS (5th point release of "Jammy Jellyfish") 
was released today (12th September 2024).

However, the download links at:

https://ubuntu-mate.org/download/amd64/jammy/

... are still pointing to :

https://cdimage.ubuntu.com/ubuntu-mate/releases/22.04/release/ubuntu-mate-22.04.4-desktop-amd64.iso

.... which no longer exists (returns a 404 error).

This commit and Pull Request replaces "22.04.4" by "22.04.5" in 
the version number and updates the location of the ISO file, 
the SHA256 checksum and the Magnet link accordingly.

_data/downloads.yml

@@ -15,7 +15,7 @@ releases:
             year: 2023
 
     jammy:
-        name: "22.04.4 LTS"
+        name: "22.04.5 LTS"
         codename: "Jammy Jellyfish"
         mascot: "jammy.svg"
         wallpaper: "focal.jpg"
@@ -71,10 +71,10 @@ arch:
 downloads:
     amd64:
         - release: jammy
-          url: "https://cdimage.ubuntu.com/ubuntu-mate/releases/22.04/release/ubuntu-mate-22.04.4-desktop-amd64.iso"
-          sha256sum: "09f52b8bac46e3cf07e90bc4ed9f3dd1a0efe0ff3fc65d9edd8c639cb6dcb391"
+          url: "https://cdimage.ubuntu.com/ubuntu-mate/releases/22.04/release/ubuntu-mate-22.04.5-desktop-amd64.iso"
+          sha256sum: "b382a3aebffc916cce71369e0c09719dd819b8b6ab308d4396ac31c1ada867c4"
           size: "3.5 GB"
-          magnet-uri: "magnet:?xt=urn:btih:f9623b09f6e2d07060678557f7b5263440b3cdfa&dn=ubuntu-mate-22.04.4-desktop-amd64.iso&tr=https%3A%2F%2Ftorrent.ubuntu.com%2Fannounce"
+          magnet-uri: "magnet:?xt=urn:btih:8fcb95f456700f9938c049ccb2ce60c423e2b6fa&dn=ubuntu-mate-22.04.5-desktop-amd64.iso&tr=https%3A%2F%2Ftorrent.ubuntu.com%2Fannounce"
 
         - release: mantic
           url: "https://cdimage.ubuntu.com/ubuntu-mate/releases/23.10/release/ubuntu-mate-23.10-desktop-amd64.iso"