bitcoin

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fanquake 60132382a7 Merge bitcoin/bitcoin#20867 : Support up to 20 keys for multisig under Segwit context

ebd4be43cc doc: add release notes for 20867 (Antoine Poinsot)
5aa50ab9cc rpc/util: multisig: only check redeemScript size is <= 520 for P2SH (Antoine Poinsot)
063df9e897 test/functional: standardness sanity checks for P2(W)SH multisig (Antoine Poinsot)
ae0429d3af script: allow up to 20 keys in wsh() descriptors (Antoine Poinsot)
9fc68faf35 script: match multisigs with up to MAX_PUBKEYS_PER_MULTISIG keys (Antoine Poinsot)

Pull request description:

  As described in https://github.com/bitcoin/bitcoin/issues/20620 multisigs are currently limited to 16 keys in descriptors and RPC helpers, even for P2WSH and P2SH-P2WSH.

  This adds support for multisig with up to 20 keys (which are already standard) for Segwit v0 context for descriptors (`wsh()`, `sh(wsh())`) and RPC helpers.

  Fixes https://github.com/bitcoin/bitcoin/issues/20620

ACKs for top commit:
  meshcollider:
    re-utACK ebd4be43cc
  instagibbs:
    re-ACK ebd4be43cc

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