Update Rust crate config to 0.15

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
config	dependencies	minor	0.11 → 0.15

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Configuration

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.16%. Comparing base (09c1686) to head (b106efb).
Report is 1 commits behind head on master.

❗ Current head b106efb differs from pull request most recent head eb45e97. Consider uploading reports for the commit eb45e97 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #16      +/-   ##
==========================================
+ Coverage   92.40%   96.16%   +3.76%     
==========================================
  Files          22       27       +5     
  Lines         408     1199     +791     
==========================================
+ Hits          377     1153     +776     
- Misses         31       46      +15     

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