Merge branch 'nixpkgs-upgrade-2022-07-25' into 'develop'

bump nixpkgs version

See merge request !320

nixpkgs.json

 {
   "name": "source",
-  "url": "https://releases.nixos.org/nixos/21.11/nixos-21.11.337967.573603b7fdb/nixexprs.tar.xz",
-  "sha256": "1f0lbz654c87ba0f3vxmzfkarcqxb9j2nik9knq15ndbqvpdyvvc"
+  "url": "https://releases.nixos.org/nixos/21.11/nixos-21.11.337971.a1fe662eb26/nixexprs.tar.xz",
+  "sha256": "0insm3dm8k2mq5k5fs78lnfrx0da7v466mznbyk0534qr66fmf9w"
 }
\ No newline at end of file