build(deps): bump the submodules group with 2 updates

Bumps the submodules group with 2 updates: [bgfx](https://github.com/bkaradzic/bgfx) and [bimg](https://github.com/bkaradzic/bimg).


Updates `bgfx` from `14e0aa5` to `23baae9`
- [Commits](bkaradzic/bgfx@14e0aa5...23baae9)

Updates `bimg` from `446b9eb` to `3af74f3`
- [Commits](bkaradzic/bimg@446b9eb...3af74f3)

---
updated-dependencies:
- dependency-name: bgfx
  dependency-version: 23baae9
  dependency-type: direct:production
  dependency-group: submodules
- dependency-name: bimg
  dependency-version: 3af74f3fe1a36c1ce17d2443c352eb8dbb3a5bd4
  dependency-type: direct:production
  dependency-group: submodules
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]