message: sanitizers: Add suppression for unsigned-integer-overflow in libstdc++ basic_string.tcc
diff: # contains files in which we expect unsigned integer overflows to occur. The
  # list is used to suppress -fsanitize=integer warnings when running our CI UBSan
  # job.
  +unsigned-integer-overflow:*/include/c++/*/bits/basic_string.tcc
  unsigned-integer-overflow:arith_uint256.h
  unsigned-integer-overflow:basic_string.h
  unsigned-integer-overflow:bench/bench.h
  