imp: add version to tm headers in ibctesting (release/v6.3.x) (#6179)

* imp: add version to tm headers in ibctesting

* chore: rm docs and update broken links

* chore: rm github link checker

RELEASES.md

@@ -19,7 +19,7 @@ When bumping the dependencies of [Cosmos SDK](https://github.com/cosmos/cosmos-s
 
 To summarize: **All our ibc-go releases allow chains to communicate successfully with any chain running any version of our code**. That is to say, we are still using IBC protocol specification v1.0. 
 
-We ensure all major releases are supported by relayers ([hermes](https://github.com/informalsystems/ibc-rs), [rly](https://github.com/strangelove-ventures/relayer) and [ts-relayer](https://github.com/confio/ts-relayer) at the moment) which can relay between the new major release and older releases. We have no plans of upgrading to an IBC protocol specification v2.0, as this would be very disruptive to the ecosystem.
+We ensure all major releases are supported by relayers ([hermes](https://github.com/informalsystems/ibc-rs), [rly](https://github.com/cosmos/relayer) and [ts-relayer](https://github.com/confio/ts-relayer) at the moment) which can relay between the new major release and older releases. We have no plans of upgrading to an IBC protocol specification v2.0, as this would be very disruptive to the ecosystem.
 
 ## Release cycle