It should be '1', not '3' as there is currently nothing to update to.
Currently dnsdist complains with:
```
PowerDNS DNSDist Security Update Mandatory: Unsupported pre-release
```
-@ 86400 IN SOA pdns-public-ns1.powerdns.com. pieter\.lexis.powerdns.com. 2021092301 10800 3600 604800 10800
+@ 86400 IN SOA pdns-public-ns1.powerdns.com. pieter\.lexis.powerdns.com. 2021092302 10800 3600 604800 10800
@ 3600 IN NS pdns-public-ns1.powerdns.com.
@ 3600 IN NS pdns-public-ns2.powerdns.com.
dnsdist-1.6.0-rc2.security-status 60 IN TXT "3 Unsupported pre-release"
dnsdist-1.6.0.security-status 60 IN TXT "1 OK"
dnsdist-1.6.1.security-status 60 IN TXT "1 OK"
-dnsdist-1.7.0-alpha1.security-status 60 IN TXT "3 Unsupported pre-release"
+dnsdist-1.7.0-alpha1.security-status 60 IN TXT "1 Unsupported pre-release"