Bump deps/sdl from e9535fa to b54c5fd

Bumps [deps/sdl](https://github.com/libsdl-org/SDL) from `e9535fa` to `b54c5fd`.
- [Release notes](https://github.com/libsdl-org/SDL/releases)
- [Commits](libsdl-org/SDL@e9535fa...b54c5fd)

---
updated-dependencies:
- dependency-name: deps/sdl
  dependency-version: b54c5fd79c3d078337d170944e635552107eda89
  dependency-type: direct:production
...

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

Author: dependabot[bot]