build(deps): bump the submodules group across 1 directory with 2 updates

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


Updates `bgfx` from `409fbc5` to `f29c1b7`
- [Commits](bkaradzic/bgfx@409fbc5...f29c1b7)

Updates `bx` from `3d53a4a` to `c300a0c`
- [Commits](bkaradzic/bx@3d53a4a...c300a0c)

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

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