chore: bump uv to 0.13 in the project template

[vdusek]

The cookiecutter project template's Dockerfile copies the uv binary from the ghcr.io/astral-sh/uv:0.13 image, the current line (0.13.1 at the time of writing), so new uv-based projects build with it.

✍️ Drafted by Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.12%. Comparing base (680c7ef) to head (04195b0).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2330      +/-   ##
==========================================
- Coverage   94.15%   94.12%   -0.03%     
==========================================
  Files         184      184              
  Lines       13644    13644              
==========================================
- Hits        12846    12843       -3     
- Misses        798      801       +3     

Flag	Coverage Δ
unit	94.12% <ø> (-0.03%)	⬇️

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[Mantisus]

LGTM

[apify-approval-mirror]

Mirroring approval from @Mantisus.