put a limit on some caches that may grow kinda large

activity.go

@@ -1158,7 +1158,7 @@ var oldjonks = cache.New(cache.Options{Filler: func(xid string) ([]byte, bool) {
 	j["@context"] = itiswhatitis
 
 	return j.ToBytes(), true
-}})
+}, Limit: 128})
 
 func gimmejonk(xid string) ([]byte, bool) {
 	var j []byte

fun.go

@@ -603,7 +603,7 @@ var zaggies = cache.New(cache.Options{Filler: func(keyname string) (*rsa.PublicK
 		return key, true
 	}
 	return nil, true
-}})
+}, Limit: 512})
 
 func zaggy(keyname string) *rsa.PublicKey {
 	var key *rsa.PublicKey