Logging is too verbose for local files

[rfrenchseti]

Retrieving a local file can log:

2025-10-01 15:18:19,577 - filecache.file_cache - DEBUG - Performing locked multi-file retrieval of:
2025-10-01 15:18:19,577 - filecache.file_cache - DEBUG -     Local file  file:////home/rfrench/DS/Shared/OOPS-Resources/SPICE/General/LSK/naif0012.tls
2025-10-01 15:18:19,577 - filecache.file_cache - DEBUG - Multi-file retrieval complete

This is needlessly verbose.