Update the PoH policy links to v1.3 everywhere.

[jaybuidl]

The current links are (all over the place) pointing to v1.2 but the current one is 1.3.

https://ipfs.kleros.io/ipfs/QmXDiiBAizCPoLqHvcfTzuMT7uvFEe1j3s4TgoWWd4k5np/proof-of-humanity-registry-policy-v1.3.pdf

[jaybuidl]

As a long term solution we should set up a ENS CONTENTS record under policy.poh.eth, that would be easier to maintain.