Bump external/fmt from cc2ba8f to e9eaa27

Bumps [external/fmt](https://github.com/fmtlib/fmt) from `cc2ba8f` to `e9eaa27`.
- [Release notes](https://github.com/fmtlib/fmt/releases)
- [Commits](fmtlib/fmt@cc2ba8f...e9eaa27)

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

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