feat: add support for musllinux_aarch64

Signed-off-by: JP-Ellis <josh@jpellis.me>

Author: JP-Ellis

hatch_build.py

@@ -283,6 +283,8 @@ def _pact_lib_url(self, version: str) -> str:  # noqa: C901, PLR0912
             os = "linux"
             if platform.endswith("x86_64"):
                 machine = "x86_64-musl"
+            elif platform.endswith("aarch64"):
+                machine = "aarch64-musl"
             else:
                 raise UnsupportedPlatformError(platform)
             return PACT_LIB_URL.format(