* upstream/main: (1475 commits)
  Docs: replace all `datetime` imports with `import datetime as dt` (#145640)
  gh-146153: Use `frozendict` in pure python fallback for `curses.has_key` (#146154)
  gh-138234: clarify returncode behavior for subprocesses created with `shell=True` (#138536)
  gh-140947: fix contextvars handling for server tasks in asyncio  (#141158)
  GH-100108: Add async generators best practices section (#141885)
  GH-145667: Merge `GET_ITER` and `GET_YIELD_FROM_ITER` (GH-146120)
  gh-146228: Better fork support in cached FastPath (#146231)
  gh-146227: Fix wrong type in _Py_atomic_load_uint16 in pyatomic_std.h (gh-146229)
  gh-145980: Fix copy/paste mistake in binascii.c (#146230)
  gh-146092: Raise MemoryError on allocation failure in _zoneinfo (#146165)
  gh-91279: Note `SOURCE_DATE_EPOCH` support in `ZipFile.writestr()` doc (#139396)
  gh-146196: Fix Undefined Behavior in _PyUnicodeWriter_WriteASCIIString() (#146201)
  gh-143930: Reject leading dashes in webbrowser URLs
  gh-145916: Soft-deprecate ctypes.util.find_library (GH-145919)
  gh-146205: Check the errno with != 0 in close impls in select module (#146206)
  gh-146171: Fix nested AttributeError suggestions (#146188)
  gh-146099: Optimize _GUARD_CODE_VERSION+IP via function version symbols (GH-146101)
  gh-145980: Add support for alternative alphabets in the binascii module (GH-145981)
  gh-145754: Update signature retrieval in unittest.mock to use forwardref annotation format (#145756)
  gh-145177: Add emscripten run --test, uses test args from config.toml (#146160)
  ...