Bump bollard + use proper Ledger Docker container

[yogh333]

No description provided.

[Copilot]

Pull Request Overview

This PR updates the simulator to support three new Ledger device models (Stax, Flex, and NanoGen5), migrates from bollard 0.18 to 0.19.4, and makes the display mode optional. The changes include API updates to use builder patterns, switching to a new Docker image, and adding X11 forwarding for graphical display support.

Key Changes:

• Added support for three new Ledger models: Stax, Flex, and NanoGen5
• Migrated bollard library from 0.18 to 0.19.4 with corresponding API changes to use builder patterns
• Changed display mode from required with default to optional, and modified default http_port from 5000 to 5001

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 5 comments.

File	Description
sim/src/lib.rs	Added three new Model variants (Stax, Flex, NanoGen5), changed display field to Option, updated default http_port, and adjusted args() method to handle optional display
sim/src/drivers/docker.rs	Updated imports to use new bollard builder APIs, changed Docker image to ledger-app-dev-tools, modified container naming to use model instead of port, added X11 forwarding support, and applied builder patterns throughout
sim/Cargo.toml	Updated bollard dependency from 0.18 to 0.19.4

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