ci: support development releases of Python (#3419)

* ci: support development releases of Python

* fix: better PyPy support

* fix: patch over a few more pypy issues

* Try to patch

* Properly follow pep667

* Fix typo

* Whoops, 667 not in yet

* For testing

* More testing

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Try to backport

* Try to simplify fix

* Nail down the fix

* Try pypy workaround

* Typo

* one last typo

* Replacing 0x03110000 with 0x030B0000

* Add TODO. Drop PyPy

* Fix typo

* Revert catch upgrade

* fix: minor cleanup, try pypy again

Co-authored-by: Aaron Gokaslan <skylion.aaron@gmail.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Ralf W. Grosse-Kunstleve <rwgk@google.com>

include/pybind11/eval.h

@@ -19,11 +19,11 @@ PYBIND11_NAMESPACE_BEGIN(PYBIND11_NAMESPACE)
 PYBIND11_NAMESPACE_BEGIN(detail)
 
 inline void ensure_builtins_in_globals(object &global) {
-    #if PY_VERSION_HEX < 0x03080000
+    #if defined(PYPY_VERSION) || PY_VERSION_HEX < 0x03080000
         // Running exec and eval on Python 2 and 3 adds `builtins` module under
         // `__builtins__` key to globals if not yet present.
         // Python 3.8 made PyRun_String behave similarly. Let's also do that for
-        // older versions, for consistency.
+        // older versions, for consistency. This was missing from PyPy3.8 7.3.7.
         if (!global.contains("__builtins__"))
             global["__builtins__"] = module_::import(PYBIND11_BUILTINS_MODULE);
     #else