LOC-5083: Add support for Linux arm64 binary

Detect arm64 architecture via platform.machine() == 'aarch64' and
download BrowserStackLocal-linux-arm64 binary. This check is placed
before the generic is_64bits check to avoid arm64 falling through to
the x64 path.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: yashdsaraf

browserstack/local_binary.py

@@ -24,6 +24,8 @@ def __init__(self, key, error_object=None):
     elif osname == 'Linux':
       if self.is_alpine():
         self.http_path = source_url + "BrowserStackLocal-alpine"
+      elif platform.machine() == 'aarch64':
+        self.http_path = source_url + "BrowserStackLocal-linux-arm64"
       else:
         if is_64bits:
           self.http_path = source_url + "BrowserStackLocal-linux-x64"