Update http cache rules to be more effective

[glensc]

Might even work like offline mode now.

[glensc]

weird errors have appeared with cold cache

WARNING  Connection pool is full, discarding connection: 192-168-x-y.[redacted].plex.direct. Connection pool size: 10  
WARNING  Connection pool is full, discarding connection: 192-168-x-y.[redacted].plex.direct. Connection pool size: 10  
WARNING  Connection pool is full, discarding connection: 192-168-x-y.[redacted].plex.direct. Connection pool size: 10

comes from urllib3

site-packages/pip/_vendor/urllib3/connectionpool.py:                "Connection pool is full, discarding connection: %s. Connection pool size: %s",

EDIT: Asked question about it in requests-cache:

• stale_while_revalidate pool size and shutdown requests-cache/requests-cache#978