9e6b8faf84 feat: add version three variant to transaction version (Rob N)
Pull request description:
Topologically restricted transactions are now considered standard as of Bitcoin 28.0.
ACKs for top commit:
apoelstra:
ACK 9e6b8faf84 successfully ran local tests
tcharding:
ACK 9e6b8faf84
Tree-SHA512: 289b986304e206802f04cee6607087167f6d91d8a81d4fc49ed01c430f4f6ad00b44646fbefdd000148fc5bfe2d257f92b386bfaf4405c482e4e438d830ab586