Bump external/d3d8to9 in the submodules group

Bumps the submodules group with 1 update: [external/d3d8to9](https://github.com/crosire/d3d8to9).


Updates `external/d3d8to9` from `429891b` to `4f56d94`
- [Release notes](https://github.com/crosire/d3d8to9/releases)
- [Commits](crosire/d3d8to9@429891b...4f56d94)

---
updated-dependencies:
- dependency-name: external/d3d8to9
  dependency-type: direct:production
  dependency-group: submodules
...

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