Changelog:
============
-Added support for PyPy 3.10 and Python 3.12
-Updated RTD configuration to include a dummy index.rst redirecting to
contents.html, ensuring compatibility with third-party documentation and search
indexes.
-Fixed the API breakage wih decoder.decode(substrateFun=...).
Signed-off-by: Wang Mingyu <wangmy@fujitsu.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>