Update flake.lock

[github-actions[bot]]

Automated changes by the update-flake-lock GitHub Action.

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/f21e4546e3ede7ae34d12a84602a22246b31f7e0?narHash=sha256-thYTdWqCRipwPRxWiTiH1vusLuAy0okjOyzRx4hLWh4%3D' (2025-05-03)
  → 'github:NixOS/nixpkgs/a4ff0e3c64846abea89662bfbacf037ef4b34207?narHash=sha256-UAaWOyQhdp7nXzsbmLVC67fo%2BQetzoTm9hsPf9X3yr4%3D' (2025-06-06)

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Pull Request Revisions

Revision	Description
r7	Nixpkgs locked to newer revision Updated Nixpkgs lock with a more recent commit, changing lastModified and narHash values
r6	Nixpkgs lock file updated Updated Nixpkgs lock with new commit, incrementing lastModified and changing repository revision
r5	Updated Nixpkgs lock file version Bumped Nixpkgs dependency to a newer commit with updated hash and modified last modified timestamp
r4	Updated Nixpkgs to newer commit Bumped Nixpkgs lock to a newer commit with updated hash and revision
r3	Updated Nixpkgs repository lock Updated Nixpkgs repository lock with new commit, including modified lastModified and narHash values
r2	Nixpkgs lock file updated Updated Nixpkgs lock file with new commit, increasing last modified timestamp and changing narHash
r1	Nixpkgs lock updated to new revision Updated Nixpkgs lock with new commit, incrementing lastModified and changing repository revision hash

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