Revert "Add CMAKE_CXX_STANDARD"

This reverts commit 84a2e4e.

Author: Creeper19472

src/serious_python/example/flask_example/windows/CMakeLists.txt

@@ -1,6 +1,5 @@
 # Project-level configuration.
 cmake_minimum_required(VERSION 3.14)
-set(CMAKE_CXX_STANDARD 23)
 project(flask_example LANGUAGES CXX)
 
 # The name of the executable created for the application. Change this to change

src/serious_python/example/flet_example/windows/CMakeLists.txt

@@ -1,6 +1,5 @@
 # Project-level configuration.
 cmake_minimum_required(VERSION 3.14)
-set(CMAKE_CXX_STANDARD 23)
 project(flet_example LANGUAGES CXX)
 
 # The name of the executable created for the application. Change this to change

src/serious_python/example/run_example/windows/CMakeLists.txt

@@ -1,6 +1,5 @@
 # Project-level configuration.
 cmake_minimum_required(VERSION 3.14)
-set(CMAKE_CXX_STANDARD 23)
 project(run_example LANGUAGES CXX)
 
 # The name of the executable created for the application. Change this to change

src/serious_python_windows/windows/CMakeLists.txt

@@ -3,7 +3,6 @@
 # version, as doing so will cause the plugin to fail to compile for some
 # customers of the plugin.
 cmake_minimum_required(VERSION 3.14)
-set(CMAKE_CXX_STANDARD 23)
 
 # Project-level configuration.
 set(PROJECT_NAME "serious_python_windows")