Bump external/fmt from 1a79bbf to 0379bf3

Bumps [external/fmt](https://github.com/fmtlib/fmt) from `1a79bbf` to `0379bf3`.
- [Release notes](https://github.com/fmtlib/fmt/releases)
- [Commits](fmtlib/fmt@1a79bbf...0379bf3)

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

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