RW-826 Update base theme with CLS in OCHA Services performance improvement

[left23]

chore: update base theme to latest v9.3.1 to avail of CLS fix in OCHA Services

See release https://github.com/UN-OCHA/common_design/releases/tag/v9.3.1 and UN-OCHA/common_design#458 for more.

Refs: RW-826

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PHP 8.2.14 (cli) (built: Dec 21 2023 20:19:50) (NTS) Copyright (c) The PHP Group Zend Engine v4.2.14, Copyright (c) Zend Technologies with Zend OPcache v8.2.14, Copyright (c), by Zend Technologies with Xdebug v3.3.0, Copyright (c) 2002-2023, by Derick Rethans Composer version 2.6.6 2023-12-08 18:32:26

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Pusher: @left23, Action: pull_request, Workflow: Run tests