Tests fail on loading cache from disk

```
t/cache.t ........ 3/? Failed to load cache from disk: Magic number checking on storable file failed at /usr/local/lib/x86_64-linux-gnu/perl/5.34.0/Storable.pm line 421, at /root/.cpanm/work/1764882416.1899861/App-dnsq-1.1.0/t/../lib/DNSQuery/Cache.pm line 267
```
