flake: update flake.lock

[github-actions]

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

Flake lock file updates:

• Updated input 'nixpkgs':
    'path:/nix/store/gg86rfp39vc7chqsszk32q7995hz4943-source?lastModified=0&narHash=sha256-JwQZIGSYnRNOgDDoIgqKITrPVil%2BRMWHsZH1eE1VGN0%3D' (1970-01-01)
  → 'github:NixOS/nixpkgs/1128e89fd5e11bb25aedbfc287733c6502202ea9?narHash=sha256-3ebRdThRic9bHMuNi2IAA/ek9b32bsy8F5R4SvGTIog%3D' (2025-02-13)
• Updated input 'nixvim':
    'github:nix-community/nixvim/13341a4c1238b7974e7bad9c7a6d5c51ca3cf81a?narHash=sha256-BEmyAozR3Pc2qwPtC4rgUglzi3cw4nv4fXEY23NxOrQ%3D' (2025-02-09)
  → 'github:nix-community/nixvim/b8c55873998948bf14a2b6cf30f9ad5ecdf79818?narHash=sha256-maNBjf9whO303r4%2B8ekfAZOrf3sHnw6DLiSph5xnXJw%3D' (2025-02-15)

Running GitHub Actions on this PR

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To run GitHub Actions workflows on this PR, run:

git branch -D update_flake_lock_action
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git checkout update_flake_lock_action
git commit --amend --no-edit
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