[6.x] Harden SVG sanitization - #15095
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`Uploader::write()` used a case-sensitive check against `.svg`, so files like `image.SVG` would bypass `Svg::sanitize()` entirely.
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This pull request fixes an issue where SVG sanitization was skipped for uppercase or mixed-case
.svgextensions (e.g.image.SVG), sinceUploader::write()checked the extension case-sensitively.This PR fixes it by lowercasing the destination path before checking its extension.