Improve some types in arraycontext.pytest #1962

Job	Run time
Typos	5s
Ruff	9s
Pytest Conda Py3 POCL	2m 20s
Examples Conda Py3	1m 20s
Pytest Conda Py3 Intel	2m 17s
Tests for downstream project meshmode	11m 20s
Documentation	1m 48s
Tests for downstream project mirgecom_examples	6s
basedpyright	1m 50s
Tests for downstream project grudge	11m 18s
Tests for downstream project mirgecom	7s
	32m 40s

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