EagerJAXArrayContext: remove stray-ish einsum warning #1822

Job	Run time
Typos	4s
basedpyright	1m 31s
Mypy	1m 45s
Pytest Conda Py3 POCL	2m 19s
Pytest Conda Py3 Intel	1m 53s
Ruff	5s
Documentation	1m 33s
Tests for downstream project meshmode	11m 11s
Tests for downstream project grudge	9m 46s
Examples Conda Py3	1m 26s
Tests for downstream project mirgecom	4s
Tests for downstream project mirgecom_examples	4s
	31m 41s

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