From: Xiangzhe <xiangzhedev@gmail.com>
Subject: [PATCH] build: use C++20 for current protobuf and abseil-cpp

Abseil 20260107 and newer require C++20.  EternalTerminal links against
Abseil through protobuf, so compiling the generated protobuf sources as
C++17 fails with missing std::{partial,strong,weak}_ordering types.

--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -249,7 +249,7 @@ if(UNIX)
 endif()

-# Enable C++-17
-set(CMAKE_CXX_STANDARD 17)
+# Enable C++-20
+set(CMAKE_CXX_STANDARD 20)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)

 # Enable compile commands export for vscode