clang-tidy: turn on modernize-use-noexcept

src/.clang-tidy

@@ -4,6 +4,7 @@ bugprone-argument-comment,
 bugprone-use-after-move,
 misc-unused-using-decls,
 modernize-use-default-member-init,
+modernize-use-noexcept,
 modernize-use-nullptr,
 performance-*,
 -performance-inefficient-string-concatenation,