Updating to C++20

This patch updates the CMakeLists to use C++20

Tested:
Compiled and service continues to run as before.

Change-Id: I2fc040378332e98ddc9c80d660f5997d0caa49f4
Signed-off-by: Alex Schendel <alex.schendel@intel.com>
diff --git a/service/CMakeLists.txt b/service/CMakeLists.txt
index a3a15a2..ce08540 100644
--- a/service/CMakeLists.txt
+++ b/service/CMakeLists.txt
@@ -1,6 +1,6 @@
 cmake_minimum_required(VERSION 3.5 FATAL_ERROR)
 project(pfr-manager CXX)
-set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD 20)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 # Temporarily disable rtti
 # See https://github.com/chriskohlhoff/asio/issues/533