Bump version to 3.2.3.0: relax mini_portile2 constraint for rdkafka compatibility

[guilhermemsnogueira]

Problem

salsify_libxml_ruby pins mini_portile2 ~> 2.5.0 (previously relaxed to ~> 2.5 in aa6aff3 but still insufficient). rdkafka >= 0.13.1 requires mini_portile2 ~> 2.6, making the two gems mutually incompatible.

This blocks upgrading salsify_kafka from 5.5.0 to 8.x in Puddle (required by GDSN-3754), since salsify_kafka >= 8.0.0 depends on rdkafka >= 0.13.1, < 0.20.0.

Solution

Relax the mini_portile2 constraint from ~> 2.5 to >= 2.5, < 3, allowing any 2.x version including 2.6 and 2.7. Bump gem version to 3.2.3.0.

Changes

• salsify_libxml_ruby.gemspec: ~> 2.5 → >= 2.5, < 3
• ext/libxml/extconf.rb: matching change in extconf (kept in sync per the comment)
• lib/libxml/version.rb: 3.2.2.0 → 3.2.3.0
• HISTORY: release entry for 3.2.3.0

Unblocks

Once this is published, Puddle can upgrade salsify_kafka to 8.2.2 and salsify_organizations to 0.14.2, enabling the SimpleConsumer E2E flow for GDSN-3754.