ci: fix comparing benchmarks

[mgrachev]

✔ Checklist:

• Commit messages have been written in Conventional Commits format;
• This PR has been added to CHANGELOG.md (at the top of the list);
• Tests for the changes have been added (for bug fixes / features);
• Docs have been added / updated on the dotenv-linter.github.io (for bug fixes / features).

[codecov-commenter]

Codecov Report

Merging #424 (d5693d2) into master (889636e) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #424   +/-   ##
=======================================
  Coverage   99.01%   99.01%           
=======================================
  Files          38       38           
  Lines        2746     2747    +1     
=======================================
+ Hits         2719     2720    +1     
  Misses         27       27           

Impacted Files	Coverage Δ
src/common/warning.rs	100.00% <100.00%> (ø)
src/lib.rs	98.54% <0.00%> (+0.01%)	⬆️

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[github-actions]

Benchmark for 3f3c540

Click to view benchmark

Test	PR Benchmark	Master Benchmark	%
dotenv_linter check	66.6±6.87µs	63.4±4.59µs	+5.05%
dotenv_linter compare	56.4±4.41µs	51.0±3.96µs	+10.59%
dotenv_linter fix	236.9±283.09µs	188.8±13.88µs	+25.48%
dotenv_linter fix with backup	238.5±15.50µs	288.2±472.74µs	-17.24%

[github-actions]

Benchmark for fdcf9c5

Click to view benchmark

Test	PR Benchmark	Master Benchmark	%
dotenv_linter check	75.2±5.01µs	74.3±4.73µs	+1.21%
dotenv_linter compare	64.6±4.04µs	61.8±5.43µs	+4.53%
dotenv_linter fix	194.5±16.18µs	213.8±20.74µs	-9.03%
dotenv_linter fix with backup	260.8±24.35µs	273.3±73.96µs	-4.57%