SslInfo does not use its Clock when checking certificate validity

[wilkinsona]

I noticed this as I was confused by SslMeterBinderTests where there are several certificates that are considered valid despite the tests using a fixed clock of 2024-10-21T13:51:40Z and the certificates not being valid until 2024-10-22.

While the Clock is new in 3.5, we may want to do something in 3.4 as well because SslInfoTests will start failing in the future when the certificates used for testing expire. They could prevent someone from rebuilding a tag unless they disable the tests.

Flagging for discussion so that we can decide what to do.