[LLDB] Fix TestGdbRemoteConnection.py on Windows

This fixes TestGdbRemoteConnection.py failing after PR #91570 on
AArch64 Windows LLDB buildbot.

https://lab.llvm.org/buildbot/#/builders/141/builds/376

Author: omjavaid

lldb/packages/Python/lldbsuite/test/tools/lldb-server/lldbgdbserverutils.py

@@ -14,7 +14,7 @@
 from textwrap import dedent
 import shutil
 import select
-
+import random
 
 def _get_support_exe(basename):
     support_dir = lldb.SBHostOS.GetLLDBPath(lldb.ePathTypeSupportExecutableDir)