Bump deps/GSL from caae4dd to f8ec309

Bumps [deps/GSL](https://github.com/Microsoft/GSL) from `caae4dd` to `f8ec309`.
- [Release notes](https://github.com/Microsoft/GSL/releases)
- [Commits](microsoft/GSL@caae4dd...f8ec309)

---
updated-dependencies:
- dependency-name: deps/GSL
  dependency-type: direct:production
...

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