Update dependency @0x/subproviders to v6.1.5

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
@​0x/subproviders	dependencies	patch	6.1.0 -> 6.1.5

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[codecov]

Codecov Report

Merging #448 into master will increase coverage by 0.35%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #448      +/-   ##
==========================================
+ Coverage   63.56%   63.91%   +0.35%     
==========================================
  Files         136      136              
  Lines        1872     1893      +21     
  Branches      192      194       +2     
==========================================
+ Hits         1190     1210      +20     
- Misses        627      628       +1     
  Partials       55       55              

Impacted Files	Coverage Δ
src/tokens/token-cache.js	66.66% <0.00%> (-4.77%)	⬇️
src/jobs/measure-fills/measure-fill.js	88.00% <0.00%> (-1.14%)	⬇️
src/index/fills/create-document.js	85.71% <0.00%> (-0.65%)	⬇️
src/consumers/index-fill-traders/index.js	93.10% <0.00%> (-0.23%)	⬇️
src/app/initialise.js	0.00% <0.00%> (ø)
src/fills/create-fills.js	100.00% <0.00%> (ø)
src/consumers/index-fill.js	100.00% <0.00%> (ø)
src/consumers/index-fill-value.js	0.00% <0.00%> (ø)
src/consumers/index-traded-tokens.js	0.00% <0.00%> (ø)
src/fills/apply-attributions-to-fill.js	100.00% <0.00%> (ø)
... and 17 more

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