Fix unreliable floating point equality (RUF069) #1992

Job	Run time
Pytest Conda Py3 POCL	3m 11s
Ruff	9s
Pytest Conda Py3 Intel	2m 43s
basedpyright	2m 18s
Documentation	2m 16s
Tests for downstream project grudge	11m 33s
Examples Conda Py3	1m 53s
Tests for downstream project mirgecom	5s
Tests for downstream project mirgecom_examples	5s
Typos	5s
Tests for downstream project meshmode	10m 47s
	35m 5s

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