doc: archive release notes for v27.1

doc/release-notes/release-notes-27.1.md

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+27.1 Release Notes
+=====================
+
+Bitcoin Core version 27.1 is now available from:
+
+  <https://bitcoincore.org/bin/bitcoin-core-27.1/>
+
+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
+===============
+
+### Miniscript
+
+- #29853 sign: don't assume we are parsing a sane TapMiniscript
+
+### RPC
+
+- #29869 rpc, bugfix: Enforce maximum value for setmocktime
+- #29870 rpc: Reword SighashFromStr error message
+- #30094 rpc: move UniValue in blockToJSON
+
+### Index
+
+- #29776 Fix #29767, set m_synced = true after Commit()
+
+### Gui
+
+- #gui812 Fix create unsigned transaction fee bump
+- #gui813 Don't permit port in proxy IP option
+
+### Test
+
+- #29892 test: Fix failing univalue float test
+
+### P2P
+
+- #30085 p2p: detect addnode cjdns peers in GetAddedNodeInfo()
+
+### Build
+
+- #29747 depends: fix mingw-w64 Qt DEBUG=1 build
+- #29859 build: Fix false positive CHECK_ATOMIC test
+- #29985 depends: Fix build of Qt for 32-bit platforms with recent glibc
+- #30097 crypto: disable asan for sha256_sse4 with clang and -O0
+- #30151 depends: Fetch miniupnpc sources from an alternative website
+- #30216 build: Fix building fuzz binary on on SunOS / illumos
+- #30217 depends: Update Boost download link
+
+### Doc
+
+- #29934 doc: add LLVM instruction for macOS < 13
+
+### CI
+
+- #29856 ci: Bump s390x to ubuntu:24.04
+
+### Misc
+
+- #29691 Change Luke Dashjr seed to dashjr-list-of-p2p-nodes.us
+- #30149 contrib: Renew Windows code signing certificate
+
+Credits
+=======
+
+Thanks to everyone who directly contributed to this release:
+
+- Antoine Poinsot
+- Ava Chow
+- Cory Fields
+- dergoegge
+- fanquake
+- furszy
+- Hennadii Stepanov
+- Jon Atack
+- laanwj
+- Luke Dashjr
+- MarcoFalke
+- nanlour
+- Sjors Provoost
+- willcl-ark
+
+As well as to everyone that helped with translations on
+[Transifex](https://www.transifex.com/bitcoin/bitcoin/).