upgrade clang format version

Author: lrvideckis

tests/.config/.clang-format

@@ -90,5 +90,5 @@ SpacesInCStyleCastParentheses: false
 SpacesInContainerLiterals: false
 SpacesInParentheses: false
 SpacesInSquareBrackets: false
-Standard: c++17
+Standard: c++20
 ...