Array(Protocol): rename getitem parameter #1927

Job	Run time
Pytest Conda Py3 POCL	2m 36s
Typos	5s
Pytest Conda Py3 Intel	2m 56s
Ruff	7s
basedpyright	1m 56s
Tests for downstream project meshmode	11m 51s
Documentation	1m 43s
Tests for downstream project mirgecom	5s
Examples Conda Py3	1m 27s
Tests for downstream project mirgecom_examples	6s
Tests for downstream project grudge	10m 24s
	33m 16s

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