jai-ext quantizer can sometimes exclude transparent colors from generated palette

Description

Following up https://osgeo-org.atlassian.net/browse/GEOT-5925, we need to update jai-ext dependency to 1.0.19

Environment

None

Status

Assignee

Mauro Bartolomeoli

Reporter

Mauro Bartolomeoli

Triage

None

Fix versions

Affects versions

Components

Priority

Medium
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