add linux-arm64 to download-ls (#2078)

Author: streak324

Diff for: arduino-ide-extension/scripts/download-ls.js

@@ -88,6 +88,12 @@
       lsSuffix = 'Linux_64bit.tar.gz';
       clangdSuffix = 'Linux_64bit';
       break;
+    case 'linux-arm64':
+      clangdExecutablePath = path.join(build, 'clangd');
+      clangFormatExecutablePath = path.join(build, 'clang-format');
+      lsSuffix = 'Linux_ARM64.tar.gz';
+      clangdSuffix = 'Linux_ARM64';
+      break;
     case 'win32-x64':
       clangdExecutablePath = path.join(build, 'clangd.exe');
       clangFormatExecutablePath = path.join(build, 'clang-format.exe');