Add 1.11 to test matrix and add downgrade for 1.10 in CI

[frankier]

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Benchmark Results

	main	d455b74...	main/d455b74864df60...
next_item_rules/4pl/mean_point_mepv_10	2.52 ± 0.012 ms	2.52 ± 0.014 ms	1
next_item_rules/4pl/mean_point_mepv_bare	0.865 ± 0.011 ms	0.853 ± 0.0086 ms	1.01
next_item_rules/4pl/mode_point_mepv_10	2 ± 0.014 ms	2.01 ± 0.013 ms	0.997
next_item_rules/4pl/mode_point_mepv_bare	0.814 ± 0.023 ms	0.824 ± 0.023 ms	0.988
time_to_load	16.1 ± 0.032 s	16.2 ± 0.35 s	0.996

Benchmark Plots

A plot of the benchmark results have been uploaded as an artifact to the workflow run for this PR.
Go to "Actions"->"Benchmark a pull request"->[the most recent run]->"Artifacts" (at the bottom).