Fix blob retrieval with an empty Accept header - #2545

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Failed to save: Unable to reserve cache with key setup-uv-2-x86_64-unknown-linux-gnu-ubuntu-24.04-3.14.8-pruned-375e6a523c31e5727e55663c4210cbe3deef15c60b173afa6d2ee8062930bdc9, another job may be creating this cache.

Cache reservation failed: cache write denied: token has no writable scopes