Add return type of findAvailableLogFile

[kazuooooo]

Description

Just add return type of bin/firebase.ts findAvailableLogs.
Just it🙏

Scenarios Tested

No need

Sample Commands

No need

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[bkendall]

Simple enough 😄 Thanks!

[codecov-commenter]

Codecov Report

Base: 56.29% // Head: 56.29% // No change to project coverage 👍

Coverage data is based on head (45d24ba) compared to base (ab11ced).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5189   +/-   ##
=======================================
  Coverage   56.29%   56.29%           
=======================================
  Files         310      310           
  Lines       20860    20860           
  Branches     4236     4236           
=======================================
  Hits        11744    11744           
  Misses       8099     8099           
  Partials     1017     1017           

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