refactor: remove unused parameter to CostUpdateService

[tao-stones]

Problem

CostUpdateService no longer needs to access blockstore

Summary of Changes

• remove unused parameter

Fixes #

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.2%. Comparing base (c87ab7c) to head (a15aab1).
⚠️ Report is 2876 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##           master    #7048     +/-   ##
=========================================
- Coverage    83.2%    83.2%   -0.1%     
=========================================
  Files         853      853             
  Lines      374734   374734             
=========================================
- Hits       311896   311863     -33     
- Misses      62838    62871     +33     

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