chore(deps): bump the cargo group across 3 directories with 1 update

Bumps the cargo group with 1 update in the /vext directory: [openssl](https://github.com/rust-openssl/rust-openssl).
Bumps the cargo group with 1 update in the /vext-email-gateway directory: [openssl](https://github.com/rust-openssl/rust-openssl).
Bumps the cargo group with 1 update in the /vext-email-gateway/fuzz directory: [openssl](https://github.com/rust-openssl/rust-openssl).


Updates `openssl` from 0.10.76 to 0.10.78
- [Release notes](https://github.com/rust-openssl/rust-openssl/releases)
- [Commits](rust-openssl/rust-openssl@openssl-v0.10.76...openssl-v0.10.78)

Updates `openssl` from 0.10.76 to 0.10.78
- [Release notes](https://github.com/rust-openssl/rust-openssl/releases)
- [Commits](rust-openssl/rust-openssl@openssl-v0.10.76...openssl-v0.10.78)

Updates `openssl` from 0.10.76 to 0.10.78
- [Release notes](https://github.com/rust-openssl/rust-openssl/releases)
- [Commits](rust-openssl/rust-openssl@openssl-v0.10.76...openssl-v0.10.78)

---
updated-dependencies:
- dependency-name: openssl
  dependency-version: 0.10.78
  dependency-type: indirect
  dependency-group: cargo
- dependency-name: openssl
  dependency-version: 0.10.78
  dependency-type: indirect
  dependency-group: cargo
- dependency-name: openssl
  dependency-version: 0.10.78
  dependency-type: indirect
  dependency-group: cargo
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]