build(deps): bump the submodules group across 1 directory with 3 updates

Bumps the submodules group with 3 updates in the / directory: [bgfx](https://github.com/bkaradzic/bgfx), [bx](https://github.com/bkaradzic/bx) and [bimg](https://github.com/bkaradzic/bimg).


Updates `bgfx` from `af12904` to `409fbc5`
- [Commits](bkaradzic/bgfx@af12904...409fbc5)

Updates `bx` from `e7ede51` to `3d53a4a`
- [Commits](bkaradzic/bx@e7ede51...3d53a4a)

Updates `bimg` from `2afa64c` to `aaf9125`
- [Commits](bkaradzic/bimg@2afa64c...aaf9125)

---
updated-dependencies:
- dependency-name: bgfx
  dependency-type: direct:production
  dependency-group: submodules
- dependency-name: bx
  dependency-type: direct:production
  dependency-group: submodules
- dependency-name: bimg
  dependency-type: direct:production
  dependency-group: submodules
...

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