Disable setup-uv cache save on pages-specimen shards

[yyolk]

Parallel pages-specimen shards were racing to save the same setup-uv cache key (cache-suffix: pages), which produced ~18 harmless Unable to reserve cache warnings after the Pages matrix.

This keeps restore on those shards (cache-suffix: pages) but sets save-cache: false so only pages-plan / pages / test write the cache.

- uses: astral-sh/setup-uv@v7
  with:
    cache-suffix: pages
    save-cache: false

Does not change job success; only stops the cache-save race.

  

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