Avoid deprecated code within Context.convert_event #1250

Job	Run time
mypy	29s
ruff	6s
sdist	3m 27s
parse_sdl (windows-latest, 3.2.16)	42s
parse_sdl (macos-latest, 3.2.16)	35s
test-docs	4m 11s
build (ubuntu-latest, 3.10, x64)	6m 21s
build (ubuntu-latest, pypy-3.10, x64)	5m 25s
build (windows-latest, pypy-3.10, x86)	4m 18s
build (windows-latest, pypy-3.10, x64)	3m 37s
build (windows-latest, 3.10, x86)	3m 9s
build-macos (cp310-*_universal2)	1m 50s
pyodide	2m 23s
build (windows-latest, 3.10, x64)	2m 39s
linux-wheels (x86_64, cp310-manylinux*)	4m 0s
build-macos (pp310-*)	3m 30s
tox (ubuntu-latest)	4m 28s
linux-wheels (aarch64, pp310-manylinux*)	3m 25s
linux-wheels (aarch64, cp310-manylinux*)	3m 51s
linux-wheels (x86_64, pp310-manylinux*)	3m 22s
publish	0s
	1h 1m 48s

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