build(deps): bump Externals/imgui from 3109131 to 4fa59df

Bumps [Externals/imgui](https://github.com/ocornut/imgui) from `3109131` to `4fa59df`.
- [Release notes](https://github.com/ocornut/imgui/releases)
- [Commits](ocornut/imgui@3109131...4fa59df)

---
updated-dependencies:
- dependency-name: Externals/imgui
  dependency-version: 4fa59df9fa20e4e2212070c5b1bc6cc52237093f
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]