Merge bitcoin-core/gui#808: Change example address from legacy (P2PKH) to bech32m (P2TR)

c6d1b8de89d87fe4fd171dc85557299e429e6564 gui: change example address from legacy (P2PKH) to bech32m (P2TR) (Sebastian Falbesoner)

Pull request description:

  Legacy addresses are less and less common these days and not recommended to use, so it seems senseful to also reflect that in the example addresses and update to the most recent address / output type (bech32m / P2TR). Also, as I couldn't see any value in computing these at runtime, they are pre-generated. This was done with the following Python script, executed in `./test/functional` (it's also included in the commit body, though without the she-bang):
  ```python
  #!/usr/bin/env python3
  from test_framework.segwit_addr import CHARSET, decode_segwit_address, encode_segwit_address
  from test_framework.messages import sha256

  output_key = sha256(b'bitcoin dummy taproot output key')
  for network, hrp in [('mainnet', 'bc'), ('signet', 'tb'), ('testnet', 'tb'), ('regtest', 'bcrt')]:
      dummy_address = encode_segwit_address(hrp, 1, output_key)
      while decode_segwit_address(hrp, dummy_address) != (None, None):
          last_char = CHARSET[(CHARSET.index(dummy_address[-1]) + 1) % 32]
          dummy_address = dummy_address[:-1] + last_char
      print(f'{network:7} example address: {dummy_address}')
  ```

  Note that the last bech32 character is modified in order to make the checksum fail.

  master (mainnet):

  ![image](https://github.com/bitcoin-core/gui/assets/91535/8c94cc1e-5649-47ed-8b2d-33b18654f6a2)

  PR (mainnet):

  ![image](https://github.com/bitcoin-core/gui/assets/91535/1ce208a6-1218-4850-93e0-5323c73e9049)

ACKs for top commit:
  maflcko:
    lgtm ACK c6d1b8de89d87fe4fd171dc85557299e429e6564
  pablomartin4btc:
    tACK c6d1b8de89d87fe4fd171dc85557299e429e6564

Tree-SHA512: a53c267a3e0d29b9c41bf043b123e7152fbf297e2322d74ce047ba2582b54768187162d462cc334e91a84874731c2e0793726ad44d9970c10ecfe70a1d4f3f1c

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