Increase default `PyPiMaxCacheEntries`

[JamieMagee]

This is the size of the in-memory cache for requests to PyPi. Currently it's 128, but it should be increased to a larger default value. We've had several customers use 4096 as a default value without issue.

component-detection/src/Microsoft.ComponentDetection.Detectors/pip/IPyPiClient.cs

Line 34 in 5a7cd43

private const long DEFAULTCACHEENTRIES = 128;

[JamieMagee]

Fixed by #385