Update flake lock file (#9243)
Summary:
This diff updates flake lock file and fixes compilation errors.
It pins libdwarf to the version
20210528 because nixpkgs unstable now use 0.4.2 as the default version since https://github.com/NixOS/nixpkgs/pull/195052, which is not compatible with HHVM.
Pull Request resolved: https://github.com/facebook/hhvm/pull/9243
Test Plan: See GitHub Actions
Reviewed By: alexeyt
Differential Revision:
D40131807
Pulled By: Atry
fbshipit-source-id:
feb4d07d7a2a27119077c17b2df936a889f93ca0