Update dependencies

[Ostrzyciel]

Also removed the temp files that someone accidentally committed.......

And removed CI for pypy because it's a glitchy mess that refuses to work reliably.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Files with missing lines	Coverage Δ
pyjelly/integrations/generic/parse.py	99.30% <ø> (ø)
pyjelly/integrations/generic/serialize.py	97.87% <ø> (ø)
pyjelly/integrations/rdflib/parse.py	90.29% <ø> (ø)
pyjelly/integrations/rdflib/serialize.py	98.60% <ø> (ø)

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