Fix pricing service lock on update

[rokn]

Detailed description: The pricing service was going into a locked state when an update is taking too long. This was because the mutex-es were locked at the start instead when needed.

Special notes for your reviewer:

Checklist

• [ ] Documentation added
• [x] Tests updated

[codecov[bot]]

Codecov Report

Merging #872 (667a018) into main (1983b87) will increase coverage by 0.17%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #872      +/-   ##
==========================================
+ Coverage   64.19%   64.37%   +0.17%     
==========================================
  Files          88       88              
  Lines        6787     6807      +20     
==========================================
+ Hits         4357     4382      +25     
+ Misses       2209     2204       -5     
  Partials      221      221              

Flag	Coverage Δ
unittests	64.37% <100.00%> (+0.17%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
app/services/pricing/service.go	77.42% <100.00%> (+2.63%)	:arrow_up:

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