Skip test lang/swift/async/tasks/TestSwiftTaskBacktrace.py on Windows

Author: weliveindetail

utils/windows-llvm-lit-test-overrides.txt

@@ -37,6 +37,7 @@ skip lldb-shell :: Commands/command-expr-diagnostics.test
 skip lldb-api :: commands/statistics/basic/TestStats.py
 skip lldb-unit :: Host/./HostTests.exe
 skip lldb-api :: tools/lldb-server/TestNonStop.py
+skip lldb-api :: lang/swift/async/tasks/TestSwiftTaskBacktrace.py
 
 ### Tests that pass occasionally ###