doc: archive release notes for v27.2

Author: fanquake

doc/release-notes/release-notes-27.2.md

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+27.2 Release Notes
+=====================
+
+Bitcoin Core version 27.2 is now available from:
+
+  <https://bitcoincore.org/bin/bitcoin-core-27.2/>
+
+This release includes various bug fixes and performance
+improvements, as well as updated translations.
+
+Please report bugs using the issue tracker at GitHub:
+
+  <https://github.com/bitcoin/bitcoin/issues>
+
+To receive security and update notifications, please subscribe to:
+
+  <https://bitcoincore.org/en/list/announcements/join/>
+
+How to Upgrade
+==============
+
+If you are running an older version, shut it down. Wait until it has completely
+shut down (which might take a few minutes in some cases), then run the
+installer (on Windows) or just copy over `/Applications/Bitcoin-Qt` (on macOS)
+or `bitcoind`/`bitcoin-qt` (on Linux).
+
+Upgrading directly from a version of Bitcoin Core that has reached its EOL is
+possible, but it might take some time if the data directory needs to be migrated. Old
+wallet versions of Bitcoin Core are generally supported.
+
+Compatibility
+==============
+
+Bitcoin Core is supported and extensively tested on operating systems
+using the Linux Kernel 3.17+, macOS 11.0+, and Windows 7 and newer. Bitcoin
+Core should also work on most other Unix-like systems but is not as
+frequently tested on them. It is not recommended to use Bitcoin Core on
+unsupported systems.
+
+Notable changes
+===============
+
+### P2P
+
+- #30394 net: fix race condition in self-connect detection
+
+### Init
+
+- #30435 init: change shutdown order of load block thread and scheduler
+
+### RPC
+
+- #30357 Fix cases of calls to FillPSBT errantly returning complete=true
+
+### PSBT
+
+- #29855 psbt: Check non witness utxo outpoint early
+
+### Test
+
+- #30552 test: fix constructor of msg_tx
+
+### Doc
+
+- #30504 doc: use proper doxygen formatting for CTxMemPool::cs
+
+### Build
+
+- #30283 upnp: fix build with miniupnpc 2.2.8
+- #30633 Fixes for GCC 15 compatibility
+
+### CI
+
+- #30193 ci: move ASan job to GitHub Actions from Cirrus CI
+- #30299 ci: remove unused bcc variable from workflow
+
+Credits
+=======
+
+Thanks to everyone who directly contributed to this release:
+
+- Ava Chow
+- Cory Fields
+- Martin Zumsande
+- Matt Whitlock
+- Max Edwards
+- Sebastian Falbesoner
+- Vasil Dimov
+- willcl-ark
+
+As well as to everyone that helped with translations on
+[Transifex](https://www.transifex.com/bitcoin/bitcoin/).