deps: bump openssl from 0.10.75 to 0.10.81 (#60)

Bumps [openssl](https://github.com/rust-openssl/rust-openssl) from 0.10.75 to 0.10.81.
- [Release notes](https://github.com/rust-openssl/rust-openssl/releases)
- [Commits](rust-openssl/rust-openssl@openssl-v0.10.75...openssl-v0.10.81)

---
updated-dependencies:
- dependency-name: openssl
  dependency-version: 0.10.81
  dependency-type: indirect
...

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Author: dependabot[bot]