Build Intel macOS package (flameshot-org#4115)

* Build Intel Macos package

https://github.com/actions/runner-images/tree/main

* Downgrade to `macos-13` gh worker

This seems like the last free intel worker

Author: a-b

.github/workflows/MacOS-pack.yml

@@ -32,6 +32,10 @@ jobs:
               os: macos-14,
               arch: arm64
             }
+          - {
+              os: macos-13,
+              arch: intel
+            }
     runs-on: ${{ matrix.dist.os }}
     env:
       APP_NAME: flameshot