fix CI

Author: wusatosi

.github/workflows/ci_tests.yml

@@ -50,15 +50,15 @@ jobs:
             compiler:
               cpp: g++
               c: gcc
-            cpp_version: 17
+            cpp_version: 20
             cmake_args:
               description: "Werror"
               cmake_args: "-DCMAKE_CXX_FLAGS='-Werror=all -Werror=extra'"
           - platform: ubuntu-latest
             compiler:
               cpp: g++
               c: gcc
-            cpp_version: 17
+            cpp_version: 20
             cmake_args:
               description: "Dynamic"
               cmake_args: "-DBUILD_SHARED_LIBS=on"