Bump the cargo group across 2 directories with 4 updates

Bumps the cargo group with 2 updates in the /host directory: [git2](https://github.com/rust-lang/git2-rs) and [rand](https://github.com/rust-random/rand).
Bumps the cargo group with 2 updates in the /demos/pptx-gen directory: [quinn-proto](https://github.com/quinn-rs/quinn) and [rustls-webpki](https://github.com/rustls/webpki).


Updates `git2` from 0.20.3 to 0.20.4
- [Changelog](https://github.com/rust-lang/git2-rs/blob/git2-0.20.4/CHANGELOG.md)
- [Commits](rust-lang/git2-rs@git2-0.20.3...git2-0.20.4)

Updates `rand` from 0.10.0 to 0.10.1
- [Release notes](https://github.com/rust-random/rand/releases)
- [Changelog](https://github.com/rust-random/rand/blob/master/CHANGELOG.md)
- [Commits](rust-random/rand@0.10.0...0.10.1)

Updates `quinn-proto` from 0.11.13 to 0.11.14
- [Release notes](https://github.com/quinn-rs/quinn/releases)
- [Commits](quinn-rs/quinn@quinn-proto-0.11.13...quinn-proto-0.11.14)

Updates `rustls-webpki` from 0.103.9 to 0.103.13
- [Release notes](https://github.com/rustls/webpki/releases)
- [Commits](rustls/webpki@v/0.103.9...v/0.103.13)

---
updated-dependencies:
- dependency-name: git2
  dependency-version: 0.20.4
  dependency-type: indirect
  dependency-group: cargo
- dependency-name: rand
  dependency-version: 0.10.1
  dependency-type: indirect
  dependency-group: cargo
- dependency-name: quinn-proto
  dependency-version: 0.11.14
  dependency-type: indirect
  dependency-group: cargo
- dependency-name: rustls-webpki
  dependency-version: 0.103.13
  dependency-type: indirect
  dependency-group: cargo
...

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Author: dependabot[bot]