Bump openssl from 0.10.66 to 0.10.71 in /discord_bot

Bumps [openssl](https://github.com/sfackler/rust-openssl) from 0.10.66 to 0.10.71.
- [Release notes](https://github.com/sfackler/rust-openssl/releases)
- [Commits](rust-openssl/rust-openssl@openssl-v0.10.66...openssl-v0.10.71)

---
updated-dependencies:
- dependency-name: openssl
  dependency-type: indirect
...

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

Author: dependabot[bot]