gh-actions: Upgrade nix and cachix installation actions to fix builds

wireapp / wire-server

🇪🇺 Wire back-end services

https://wire.com

GNU Affero General Public License v3.0

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Closed akshaymankar closed 3 weeks ago

akshaymankar commented 3 weeks ago

[x] ~Add a new entry in an appropriate subdirectory of changelog.d~ No changelog.
[x] Read and follow the PR guidelines