fix(db): fix find latest block extension function

[PJColombo]

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Latest commit: cd96277

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@blobscan/db	Patch

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Additional details and impacted files

@@                        Coverage Diff                        @@
##             perf/db/add-block-number-index     #420   +/-   ##
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  Branches                                  ?      981           
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  Hits                                      ?     8461           
  Misses                                    ?      964           
  Partials                                  ?        0           

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