chore(flake.lock): Update all Flake inputs (2022-11-04)

The OpenSSL 3.0.7 release fixes a high severity security vulnerability in
OpenSSL versions >= 3.0.0 <= 3.0.6. Nixpkgs switched to this version in
[Nixpkgs PR#198999][1] and the nixos-unstable channel was recently [2] updated.

This commit updates the `nixpkgs` input to the latest nixos-unstable commit.

Flake update details:

```
• Updated input 'flake-utils':
    'github:numtide/flake-utils/c0e246b9b83f637f4681389ecabcb2681b4f3af0' (2022-08-07)
  → 'github:numtide/flake-utils/5aed5285a952e0b949eb3ba02c12fa4fcfef535f' (2022-11-02)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/285e77efe87df64105ec14b204de6636fb0a7a27' (2022-10-11)
  → 'github:NixOS/nixpkgs/a2a777538d971c6b01c6e54af89ddd6567c055e8' (2022-11-03)
```

See also:
* [OpenSSL security advisory][0]
* [Nixpkgs PR #198999 ("openssl: 3.0.5 -> 3.0.7") progress][2]
* [NixOS Discourse - OpenSSL 3.0.7 update (2022-11-01) FAQ][3]
* [CVE-2022-3602][4]

[0]: https://www.openssl.org/news/secadv/20221101.txt
[1]: NixOS/nixpkgs#198999
[2]: https://nixpk.gs/pr-tracker.html?pr=198999
[3]: https://discourse.nixos.org/t/openssl-3-0-7-update-2022-11-01-faq/22875
[4]: https://nvd.nist.gov/vuln/detail/CVE-2022-3602

Author: PetarKirov