build(deps): Bump external/fmt from df249d8 to 385c01d

Bumps [external/fmt](https://github.com/fmtlib/fmt) from `df249d8` to `385c01d`.
- [Release notes](https://github.com/fmtlib/fmt/releases)
- [Commits](fmtlib/fmt@df249d8...385c01d)

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

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