Update flake.lock and related CI dependencies (#121)

* flake.lock: Update

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/666fc80e7b2afb570462423cb0e1cf1a3a34fedd' (2023-12-09)
  → 'github:NixOS/nixpkgs/bd645e8668ec6612439a9ee7e71f7eac4099d4f6' (2024-01-02)

* Update CI dependencies with adjusting to nixpkgs

Closes #116
Closes #119
Closes #120

---------

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

.github/workflows/ci.yml

@@ -12,7 +12,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: denoland/setup-deno@v1
         with:
-          deno-version: '1.38.5' # selfup { "regex": "\\d[^']+", "script": "deno --version | head -n 1 | cut -d ' ' -f 2" }
+          deno-version: '1.39.1' # selfup { "regex": "\\d[^']+", "script": "deno --version | head -n 1 | cut -d ' ' -f 2" }
       - run: deno task stylelint
 
   check:
@@ -25,5 +25,5 @@ jobs:
           dprint-version: '0.43.0' # selfup { "regex": "\\d[^']+", "script": "dprint --version | cut -d ' ' -f 2" }
       - uses: denoland/setup-deno@v1
         with:
-          deno-version: '1.38.5' # selfup { "regex": "\\d[^']+", "script": "deno --version | head -n 1 | cut -d ' ' -f 2" }
+          deno-version: '1.39.1' # selfup { "regex": "\\d[^']+", "script": "deno --version | head -n 1 | cut -d ' ' -f 2" }
       - run: deno task check