[cppcheck] Enable --std=c++20

Author: netromdk

CMakeLists.txt

@@ -128,7 +128,7 @@ if (found_cppcheck)
     cppcheck
 
     # unusedFunction can't be used with -j for some reason.
-    cppcheck --enable=all -j ${CPU_COUNT} --std=c++17 --language=c++ --inconclusive
+    cppcheck --enable=all -j ${CPU_COUNT} --std=c++20 --language=c++ --inconclusive
              --project=${CMAKE_CURRENT_BINARY_DIR}/compile_commands.json --xml 2> cppcheck.xml &&
       python3 ${CMAKE_SOURCE_DIR}/scripts/cppcheck-htmlreport.py --file=cppcheck.xml --report-dir=cppcheck