fix: blockchain info statistic

[rabbitz]

{
    "data": {
        "id": "1",
        "type": "statistic",
        "attributes": {
            "blockchain_info": {
                "is_initial_block_download": false,
                "epoch": 1979125929614586,
                "difficulty": 471576372,
                "median_time": 1697087655463,
                "chain": "ckb_testnet",
                "alerts": []
            }
        }
    }
}

[codecov-commenter]

Codecov Report

Attention: 156 lines in your changes are missing coverage. Please review.

Comparison is base (bb447e4) 66.37% compared to head (014ea0c) 66.97%.
Report is 73 commits behind head on develop.

❗ Current head 014ea0c differs from pull request most recent head a454b06. Consider uploading reports for the commit a454b06 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1469      +/-   ##
===========================================
+ Coverage    66.37%   66.97%   +0.59%     
===========================================
  Files          275      282       +7     
  Lines         7397     7609     +212     
===========================================
+ Hits          4910     5096     +186     
- Misses        2487     2513      +26     

Files	Coverage Δ
...trollers/api/v1/address_transactions_controller.rb	95.55% <100.00%> (-0.10%)	⬇️
app/controllers/api/v1/blocks_controller.rb	95.34% <ø> (-0.11%)	⬇️
...rollers/api/v1/contract_transactions_controller.rb	100.00% <100.00%> (ø)
.../controllers/api/v1/udt_transactions_controller.rb	100.00% <100.00%> (ø)
...controllers/api/v1/udt_verifications_controller.rb	100.00% <100.00%> (ø)
app/controllers/api/v1/udts_controller.rb	100.00% <100.00%> (ø)
...trollers/api/v2/pending_transactions_controller.rb	100.00% <100.00%> (ø)
app/controllers/api/v2/transactions_controller.rb	100.00% <100.00%> (ø)
app/models/cell_input.rb	61.36% <ø> (ø)
app/models/cell_output.rb	73.42% <100.00%> (-0.52%)	⬇️
... and 34 more

... and 1 file with indirect coverage changes

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