Merge pull request matplotlib#20037 from anntzer/pp37

Don't generate wheels unusable on PyPy7.3.{0,1}.

Author: tacaswell

src/ft2font_wrapper.cpp

@@ -544,7 +544,10 @@ static PyObject *PyFT2Font_set_text(PyFT2Font *self, PyObject *args, PyObject *k
     if (PyUnicode_Check(textobj)) {
         size = PyUnicode_GET_LENGTH(textobj);
         codepoints.resize(size);
-#if defined(PYPY_VERSION) && (PYPY_VERSION_NUM  < 0x07030200)
+#if defined(PYPY_VERSION) && (PYPY_VERSION_NUM < 0x07040000)
+        // PyUnicode_ReadChar is available from PyPy 7.3.2, but wheels do not
+        // specify the micro-release version, so put the version bound at 7.4
+        // to prevent generating wheels unusable on PyPy 7.3.{0,1}.
         Py_UNICODE *unistr = PyUnicode_AsUnicode(textobj);
         for (size_t i = 0; i < size; ++i) {
             codepoints[i] = unistr[i];