boost version 1.86 support

Added fix for boost::asio::spawn overload issue reported similar
to chriskohlhoff/asio#1524, during boost 1.86 migration build.

Proposed fix is to use default completion token.

Tested: verified build

Change-Id: I469a0c6eb8faac68d6b8ba4c4d3ef86838270eff
Signed-off-by: Jayanth Othayoth <ojayanth@gmail.com>
diff --git a/src/srvcfg_manager.cpp b/src/srvcfg_manager.cpp
index 69f639d..679d5a5 100644
--- a/src/srvcfg_manager.cpp
+++ b/src/srvcfg_manager.cpp
@@ -524,7 +524,8 @@
                                    }
                                }
                                updateInProgress = false;
-                           });
+                           },
+                           {});
     });
 }