Set Capella fork epoch for Goerli (sigp#4044)

Squashed commit of the following:

commit 944f3fa
Author: Paul Hauner <paul@paulhauner.com>
Date:   Mon Mar 6 10:14:42 2023 +1100

    Revert SHARDING to DENEB change

commit 29c736f
Author: Paul Hauner <paul@paulhauner.com>
Date:   Fri Mar 3 14:55:46 2023 +1100

    Set Capella fork epoch for Goerli

common/eth2_network_config/built_in_network_configs/prater/config.yaml

@@ -35,8 +35,11 @@ ALTAIR_FORK_EPOCH: 36660
 # Merge
 BELLATRIX_FORK_VERSION: 0x02001020
 BELLATRIX_FORK_EPOCH: 112260
+# Capella
+CAPELLA_FORK_VERSION: 0x03001020
+CAPELLA_FORK_EPOCH: 162304
 # Sharding
-SHARDING_FORK_VERSION: 0x03001020
+SHARDING_FORK_VERSION: 0x04001020
 SHARDING_FORK_EPOCH: 18446744073709551615
 
 # TBD, 2**32 is a placeholder. Merge transition approach is in active R&D.