Merge bitcoin/bitcoin#33004: Enable -natpmp by default

b2d07f8 Add release notes for -natpmp enabled by default (Antoine Poinsot)
3fc660d mapport: turn -natpmp to on by default (Antoine Poinsot)

Pull request description:

  This turns the default for NAT hole-punching (with [PCP](https://en.wikipedia.org/wiki/Port_Control_Protocol) or [NAT-PMP](https://en.wikipedia.org/wiki/NAT_Port_Mapping_Protocol)) to on. Closes #31663.

ACKs for top commit:
  ajtowns:
    ACK b2d07f8

Tree-SHA512: 7449510aa97ce225a662947184046cba6c8f0409719cd0b279639cedd8fdbf55a769a0088e66c7ac5b6ebabec9b2c81141ae14b7a87a5ad13be01d36c4e56661

Author: fanquake

doc/release-notes-33004.md

@@ -0,0 +1,6 @@
+Updated settings
+----------------
+
+* The `-natpmp` option is now set to `1` by default. This means nodes with `-listen` enabled (the
+  default) but running behind a firewall, such as a local network router, will be reachable if the
+  firewall/router supports any of the `PCP` or `NAT-PMP` protocols.

src/mapport.h

@@ -5,7 +5,7 @@
 #ifndef BITCOIN_MAPPORT_H
 #define BITCOIN_MAPPORT_H
 
-static constexpr bool DEFAULT_NATPMP = false;
+static constexpr bool DEFAULT_NATPMP = true;
 
 void StartMapPort(bool enable);
 void InterruptMapPort();