2.3.0 regression: <class 'bytes'> is not converted to std::vector<uint8_t> anymore

To reproduce, create the following C++ extension:

#include <pybind11/pybind11.h>
#include <pybind11/stl.h>
#include <vector>
#include <stdint.h>

void take_bytes(const std::vector<uint8_t> &raw) {}

PYBIND11_MODULE(my_ext, m) {
    m.def("take_bytes", &take_bytes);
}

And invoke it from a Python script like this:

import my_ext
my_ext.take_bytes(b'hello')

Using pybind11 2.2.4, this compiles and runs without errors.
Using pybind11 2.3.0, this compiles, but produces the following runtime error:

Traceback (most recent call last):
...
  File "hello.py", line 2, in <module>
    my_ext.take_bytes(b'hello')
TypeError: take_bytes(): incompatible function arguments. The following argument types are supported:
    1. (arg0: List[int]) -> None

This breaking change is not mentioned in the changelog or the upgrade guide.

Version info:

• Python 3.7.3 (v3.7.3:ef4ec6ed12, Mar 25 2019, 22:22:05) [MSC v.1916 64 bit (AMD64)] on win32
• Microsoft (R) C/C++ Optimizing Compiler Version 19.16.27026.1 for x64
• I'm running cl.exe with the /std:c++latest or /std:c++17 flag

Start by compiling the shown C++ extension and running the Python take_bytes(b'hello') reproduction with pybind11 2.3.0, then compare the conversion behavior with 2.2.4. Trace the std::vector<uint8_t> argument conversion from the take_bytes entry point. Done means the bytes call works again, with the breaking change also recorded in docs/changelog.rst or docs/upgrade.rst.