[lldb] Fix a -Wdeprecated-declarations warning

Fixes:

    ../../lldb/source/Symbol/LocateSymbolFileMacOSX.cpp:633:26:
        warning: 'CFPropertyListCreateFromXMLData' is deprecated:
                 first deprecated in macOS 10.10 -
                 Use CFPropertyListCreateWithData instead.
                 [-Wdeprecated-declarations]
        (CFDictionaryRef)::CFPropertyListCreateFromXMLData(
                           ^

Hopefully no behavior change.

Differential Revision: https://reviews.llvm.org/D135983