Bump external/ELFIO from c5e56b8 to 2b457dd

Bumps [external/ELFIO](https://github.com/serge1/ELFIO) from `c5e56b8` to `2b457dd`.
- [Release notes](https://github.com/serge1/ELFIO/releases)
- [Commits](serge1/ELFIO@c5e56b8...2b457dd)

---
updated-dependencies:
- dependency-name: external/ELFIO
  dependency-type: direct:production
...

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