beacon/config: add ELECTRA, FULU to knownForks (#32674)

Author: klim0v

beacon/params/config.go

@@ -38,7 +38,7 @@ import (
 // across signing different data structures.
 const syncCommitteeDomain = 7
 
-var knownForks = []string{"GENESIS", "ALTAIR", "BELLATRIX", "CAPELLA", "DENEB"}
+var knownForks = []string{"GENESIS", "ALTAIR", "BELLATRIX", "CAPELLA", "DENEB", "ELECTRA", "FULU"}
 
 // ClientConfig contains beacon light client configuration.
 type ClientConfig struct {