merge-devnet-5 and Kiln testnet version information

Please refer to the Eth R&D discord discussion on requirements before filling up this table.
(These testnets require kiln spec v2 to be implemented)

Testnet config: https://github.com/eth-clients/merge-testnets/tree/main/merge-devnet-5

Consensus layer
| client name | taking part in testnets? | git branch to use | docker image if possible
| -------- | -------- |-------- | -------- |-------- |
| Lighthouse |Y|unstable|sigp/lighthouse:latest-unstable| | |
| Teku | Y | master | consensys/teku:develop | |
| Lodestar | Y | master | chainsafe/lodestar:next | |
| Nimbus | Y | kiln | parithoshj/nimbus:merge-f6e4c31 | |
| Prysm | Y | | gcr.io/prysmaticlabs/prysm/beacon-chain:kiln-e2e5a0,gcr.io/prysmaticlabs/prysm/validator:kiln-a424f5|

Execution layer
| client name | taking part in testnets? |git branch v1 | docker image if possible |
| -------- |-------- | -------- | -------- |-------- |
| Geth | Y | merge-kiln | parithoshj/geth:master-e0a1fd5 | |
| Nethermind |Y|kiln | nethermindeth/nethermind:kiln_0.5 |
| Erigon | Y | - | |
| Besu | Y | | hyperledger/besu:22.1.2-SNAPSHOT |