* ci: update to GraalPy 24.2 and mention in README

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* tests: update for GRAALPY 24.2 and better printout

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* tests: use __graalpython__ for version number

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* Update README.rst

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Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>