message: doc: Update bips.md for 23.x
diff: -BIPs that are implemented by Bitcoin Core (up-to-date up to **v22.0**):
  +BIPs that are implemented by Bitcoin Core (up-to-date up to **v23.0**):
  * [`BIP 9`](https://github.com/bitcoin/bips/blob/master/bip-0009.mediawiki): The changes allowing multiple soft-forks to be deployed in parallel have been implemented since **v0.12.1** ([PR #7575](https://github.com/bitcoin/bitcoin/pull/7575))
  * [`BIP 11`](https://github.com/bitcoin/bips/blob/master/bip-0011.mediawiki): Multisig outputs are standard since **v0.6.0** ([PR #669](https://github.com/bitcoin/bitcoin/pull/669)).
  