ci: restore linux-aarch64 runner in PyInstaller workflow

Author: dvershinin

.github/workflows/pyinstaller.yml

@@ -25,6 +25,10 @@ jobs:
             os: linux
             arch: x86_64
             artifact: gixy-linux-x86_64
+          - runner: ubuntu-24.04-arm
+            os: linux
+            arch: aarch64
+            artifact: gixy-linux-aarch64
           - runner: windows-latest
             os: windows
             arch: x64