3537136 Replaced deprecated FileSystemInterface::EXISTS_REPLACE, bumped...

Wojciech Kukowskirequested to merge
issue/ckeditor5_plugin_pack-3537136:3537136-replace-editor_load-function-1.5.x into 1.5.x

3537136 Replaced deprecated FileSystemInterface::EXISTS_REPLACE, bumped minimum core version to 10.3 in submodules

Closes #3537136

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