ci : increase windows-cublas evict-old-files to 5d #2915
                
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This commit updates the evict-old-files parameter for the windows-cublas build job to 5 days.
The motivation for this change is to avoid the full rebuild which takes around 1.5 hours for the windows-cublas build job. Considering that there are periods of low traffic on whisper.cpp (like weekends etc.) it might be better to have a longer eviction policy to avoid the full rebuild.