session: fix test timestamp

Before we add the SQL implementation of the store, we fix this timestamp
to be a more realistic number. This is needed since in sqlite,
timestamps are serialised as strings and golang actually cant parse the
string for the current timestamp back into a time.Time. This is the
error that will be encountered:
`parsing time "99999-01-01 00:00:00 +0000 UTC" as "2006-01-02
15:04:05.999999999 -0700 MST": cannot parse "9-01-01 00:00:00 +0000 UTC"
as "-"`

Author: ellemouton

session/store_test.go

@@ -362,7 +362,7 @@ func reserveSession(db Store, label string,
 
 	return db.NewSession(
 		context.Background(), label, opts.sessType,
-		time.Date(99999, 1, 1, 0, 0, 0, 0, time.UTC),
+		time.Date(9999, 1, 1, 0, 0, 0, 0, time.UTC),
 		"foo.bar.baz:1234",
 		WithDevServer(),
 		WithPrivacy(PrivacyFlags{ClearPubkeys}),