[lldb][lldb-dap] Disable read memory test on Windows

This isn't strictly a Windows issue but for now it's the only bot
that was hit by this failure.

It can happen on Linux too but I expect we'll fix it and remove the
skip soon anyway.

Test was added in #104317.

Author: DavidSpickett

lldb/test/API/tools/lldb-dap/memory/TestDAP_memory.py

@@ -74,6 +74,10 @@ def test_memory_refs_set_variable(self):
             ].keys(),
         )
 
+    # lldb-dap assumes that all reads will be within the same region. On Windows
+    # the target string is at the very start of a region so the -1 offset causes
+    # the read to only read from the previous region and only return 1 byte.
+    @skipIfWindows
     def test_readMemory(self):
         """
         Tests the 'readMemory' request