chore: switch bitcoin-payment-instructions to moneydevkit fork (#40)

Point at the `2025-12-ldk-node-base` branch (rev bc7d03f) of our fork,
which includes a patch to accept LNURL-pay BOLT11 invoices that ship a
plain `d` description tag instead of the LUD-06-required `h =
sha256(metadata)` tag. Unblocks payouts to Bringin lightning addresses
(e.g. vincenzopalazzo@bringin.xyz) and any other LNURL servers with the
same non-compliance.

See moneydevkit/bitcoin-payment-instructions#2.

Builds clean; verified live against vincenzopalazzo@bringin.xyz which
previously failed with "BOLT 11 invoice resolved via LNURL must have a
matching description hash" and now returns a valid invoice.

Note: ldk-node still transitively pins rev 6796e87 of the same crate,
so `cargo tree -d` shows two copies of bitcoin-payment-instructions
until ldk-node is bumped in a follow-up.

Author: martinsaposnic

Cargo.toml

@@ -11,7 +11,10 @@ crate-type = ["cdylib"]
 tikv-jemallocator = { version = "0.6", features = ["disable_initial_exec_tls"] }
 
 [dependencies]
-bitcoin-payment-instructions = { version = "0.5.0", default-features = false, features = [
+# Branch: https://github.com/moneydevkit/bitcoin-payment-instructions/tree/2025-12-ldk-node-base
+# Pinned to the same git rev as ldk-node's transitive pull to avoid duplicate
+# crate compilation. Verify with `cargo tree -d | grep bitcoin-payment-instructions`.
+bitcoin-payment-instructions = { git = "https://github.com/moneydevkit/bitcoin-payment-instructions", rev = "bc7d03f", default-features = false, features = [
   "http",
 ] }
 # Branch: https://github.com/moneydevkit/ldk-node/commits/lsp-0.7.0_accept-underpaying-htlcs_with_timing_logs