Drop builds for Debian 11 and Ubuntu 22.04 (#6643)

* Delete .ci/Debian11 directory

* Delete .ci/Servatrice_Debian11 directory

* Delete .ci/Ubuntu22.04 directory

* Update desktop-build.yml

* Update release_template.md

* Add servatrice debian 12

* Update desktop-build.yml

.github/workflows/desktop-build.yml

@@ -107,12 +107,8 @@ jobs:
             package: skip    # We are packaged in Arch already
             allow-failure: yes
 
-          - distro: Debian
-            version: 11
-            package: DEB
-
           - distro: Servatrice_Debian
-            version: 11
+            version: 12
             package: DEB
             test: skip
             server_only: yes
@@ -135,14 +131,10 @@ jobs:
             version: 44
             package: RPM
 
-          - distro: Ubuntu
-            version: 22.04
-            package: DEB
-            test: skip    # Running tests on all distros is superfluous
-
           - distro: Ubuntu
             version: 24.04
             package: DEB
+            test: skip    # Running tests on all distros is superfluous
 
           - distro: Ubuntu
             version: 26.04