Bumps [deps/GSL](https://github.com/Microsoft/GSL) from `2bfd495` to `f21f29d`.
- [Release notes](https://github.com/Microsoft/GSL/releases)
- [Commits](2bfd495080...f21f29d210
)
---
updated-dependencies:
- dependency-name: deps/GSL
dependency-type: direct:production
...
Signed-off-by: dependabot[bot] <support@github.com>