Pull request type

Bug fix (non-breaking change which fixes an issue)

Description

imageObject and defaultImageDynamic in the Image widget were declared as type="image" without allowUpload, which Mendix has deprecated — DynamicValue<WebImage> is removed in Mendix 12, and Studio Pro 11.8+ already shows a design-time deprecation warning for this pattern.

This adds allowUpload="true" to both properties and regenerates typings accordingly (EditableImageValue<WebImage>). The widget's read logic in Image.tsx is unchanged — EditableImageValue exposes the same status/value.uri shape the widget already consumes, so this is a display-only migration with no new upload UI.

marketplace.minimumMXVersion is bumped to 11.12.0 since the widget XML now requires allowUpload support, which older Studio Pro versions cannot parse (verified: Studio Pro <11.8 fails to load the widget package with "The 'allowUpload' attribute is not declared").

Manually verified in Studio Pro 11.12 that both Static and Dynamic image-source configuration remain available in the property editor after this change — existing apps using a static image are not broken.

Widget version is not bumped in this PR (bumped at release time per repo convention); this change will require a major bump (2.0.0) on release due to the minimumMXVersion increase.

What should be covered while testing?

• Existing Image widget configurations (static image, dynamic/attribute-bound image, icon, image URL datasources) continue to render identically.
• No upload/file-picker UI appears anywhere on the widget.
• Widget can be added to a page in Studio Pro 11.12+; "Image source" and "Default image" properties still offer both Static and Dynamic configuration.