Knot Resolver 5.1.2 released

Bugfixes

• hints module: NODATA answers also for non-address queries (!1005)
• tls: send alert to peer if handshake fails (!1007)
• cache: fix interaction between LMDB locks and preallocation (!1013)
• cache garbage collector: fix flushing of messages to logs (!1009)
• cache garbage collector: fix insufficient GC on 32-bit systems (!1009)
• graphite module: do not block resolver on TCP failures (!1014)
• policy.rpz various fixes (!1016): $ORIGIN issues, precision of warnings, allow answering with multi-RR sets