[3.14] gh-74902: Add Unicode Grapheme Cluster Break algorithm (GH-143076)#148247

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Commits on Apr 8, 2026

[3.14] gh-74902: Add Unicode Grapheme Cluster Break algorithm (GH-143076)

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StanFromIreland
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Fix refleaks in new unicodedata classes added in gh-74902 (GH-143843)

serhiy-storchaka
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StanFromIreland
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gh-74902: Avoid hitting unicode.org for test data (GH-144195)

zware
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StanFromIreland
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