Fix: incorrect serialization

[shawn-zil]

#1969 introduced a new configuration, but missed out a serialization, which breaks deployment with z2.

before:

api_servers = [[object], [object]]

after:

api_servers = [{ port = 4201, enabled_apis = [{ apis = ["blockNumber"], namespace = "eth" }] }, { enabled_apis = ["admin", "erigon", "eth", "net", "ots", "trace", "txpool", "web3", "zilliqa"], port = 4202 }]

[github-actions]

Bencher Report

Branch	1969-missing-api-servers
Testbed	self-hosted

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Benchmark	Latency	Benchmark Result nanoseconds (ns) (Result Δ%)	Upper Boundary nanoseconds (ns) (Limit %)
process-empty/process-empty	📈 view plot 🚷 view threshold	9,553,200.00 (+2.93%)	10,682,537.29 (89.43%)
produce-full/produce-full	📈 view plot 🚷 view threshold	2,020,200,000.00 (-14.26%)	3,164,045,136.26 (63.85%)

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