improve platform detection for sling dependency

- Replaced conditional logic with platform-specific dependency declarations using PEP 508 markers.
- This simplifies the setup.py script and makes it more robust.
- Improved readability and maintainability of the dependency management.

sling/setup.py

@@ -16,24 +16,14 @@
   with readme_path.open() as file:
     README = file.read()
 
-install_requires = []
-if platform.system() == 'Linux':
-  if platform.machine() == 'aarch64':
-    install_requires = [f'sling-linux-arm64=={SLING_VERSION}']
-  else:
-    install_requires = [f'sling-linux-amd64=={SLING_VERSION}']
-elif platform.system() == 'Windows':
-  if platform.machine() == 'ARM64':
-    install_requires = [f'sling-windows-arm64=={SLING_VERSION}']
-  else:
-    install_requires = [f'sling-windows-amd64=={SLING_VERSION}']
-elif platform.system() == 'Darwin':
-  if platform.machine() == 'arm64':
-    install_requires = [f'sling-mac-arm64=={SLING_VERSION}']
-  else:
-    install_requires = [f'sling-mac-amd64=={SLING_VERSION}']
-else:
-  raise Exception(f'platform "{platform.system()}" ({platform.system()}) not supported.')
+install_requires = [
+    f'sling-linux-arm64=={SLING_VERSION} ; sys_platform=="linux" and platform_machine=="aarch64"',
+    f'sling-linux-amd64=={SLING_VERSION} ; sys_platform=="linux" and platform_machine!="aarch64"',
+    f'sling-windows-arm64=={SLING_VERSION} ; sys_platform=="win32" and platform_machine=="ARM64"',
+    f'sling-windows-amd64=={SLING_VERSION} ; sys_platform=="win32" and platform_machine!="ARM64"',
+    f'sling-mac-arm64=={SLING_VERSION} ; sys_platform=="darwin" and platform_machine=="arm64"',
+    f'sling-mac-amd64=={SLING_VERSION} ; sys_platform=="darwin" and platform_machine!="arm64"',
+]
 
 setup(
   name='sling',