CI: Remove Windows 7 build (#6625)

* Update release_template.md

* Remove Win7

.ci/release_template.md

@@ -10,7 +10,6 @@ Available pre-compiled binaries for installation:
 
   <b>Windows</b>
    • <kbd>Windows 10+</kbd>
-   • <kbd>Windows 7+</kbd>
 
   <b>macOS</b>
    • <kbd>macOS 15+</kbd> <sub><i>Sequoia</i></sub> <sub>Apple M</sub>

.github/workflows/desktop-build.yml

@@ -308,18 +308,6 @@ jobs:
             cmake_generator: Ninja
             use_ccache: 1
 
-          - os: Windows
-            target: 7
-            runner: windows-2022
-            type: Release
-            make_package: 1
-            package_suffix: "-Win7"
-            artifact_name: Windows7-installer
-            qt_version: 5.15.*
-            qt_arch: win64_msvc2019_64
-            cmake_generator: "Visual Studio 17 2022"
-            cmake_generator_platform: x64
-
           - os: Windows
             target: 10
             runner: windows-2022