Log Message:
bitcoin: update to 27.2

Notables changes since 27.1:

P2P
* net: fix race condition in self-connect detection

Init
* init: change shutdown order of load block thread and scheduler

RPC
* Fix cases of calls to FillPSBT errantly returning complete=true

PSBT
* psbt: Check non witness utxo outpoint early

Test
* test: fix constructor of msg_tx

Doc
* doc: use proper doxygen formatting for CTxMemPool::cs

Build
* upnp: fix build with miniupnpc 2.2.8
* Fixes for GCC 15 compatibility

CI
* ci: move ASan job to GitHub Actions from Cirrus CI
* ci: remove unused bcc variable from workflow

Tested on NetBSD/amd64.