Update Rust crate bdk_electrum to 0.19.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
bdk_electrum (source)	dependencies	minor	0.18.0 -> 0.19.0

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Release Notes

bitcoindevkit/bdk (bdk_electrum)

v0.19.0

Compare Source

• added OldestFirstCoinSelection impl to CoinSelectionAlgorithm
• New MSRV set to 1.56
• Unpinned tokio to 1
• Add traits to reuse Blockchains across multiple wallets (BlockchainFactory and StatelessBlockchain).
• Upgrade to rust-bitcoin 0.28
• If using the sqlite-db feature all cached wallet data is deleted due to a possible UTXO inconsistency, a wallet.sync will recreate it
• Update PkOrF in the policy module to become an enum
• Add experimental support for Taproot, including:
  • Support for tr() descriptors with complex tapscript trees
  • Creation of Taproot PSBTs (BIP-371)
  • Signing Taproot PSBTs (key spend and script spend)
  • Support for tr() descriptors in the descriptor!() macro
• Add support for Bitcoin Core 23.0 when using the rpc blockchain

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