Update cats-effect to 2.1.1

[scala-steward]

Updates org.typelevel:cats-effect from 2.0.0 to 2.1.1.
Release Notes/Changelog

I'll automatically update this PR to resolve conflicts as long as you don't change it yourself.

If you'd like to skip this version, you can just close this PR. If you have any feedback, just mention me in the comments below.

Have a fantastic day writing Scala!

Ignore future updates

Add this to your .scala-steward.conf file to ignore future updates of this dependency:

updates.ignore = [ { groupId = "org.typelevel", artifactId = "cats-effect" } ]

labels: library-update, semver-minor

[codecov]

Codecov Report

Merging #342 into master will decrease coverage by 6.54%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #342      +/-   ##
==========================================
- Coverage   92.71%   86.16%   -6.55%     
==========================================
  Files          23       23              
  Lines         535      535              
  Branches        1        1              
==========================================
- Hits          496      461      -35     
- Misses         39       74      +35

Impacted Files	Coverage Δ
...s/src/main/scala/github4s/domain/PullRequest.scala	0% <0%> (-100%)	⬇️
.../src/main/scala/github4s/http/RequestBuilder.scala	40% <0%> (-60%)	⬇️
.../scala/github4s/interpreters/AuthInterpreter.scala	46.66% <0%> (-53.34%)	⬇️
...4s/src/main/scala/github4s/http/Http4sSyntax.scala	66.66% <0%> (-33.34%)	⬇️
...ub4s/src/main/scala/github4s/http/HttpClient.scala	68.75% <0%> (-25%)	⬇️
github4s/src/main/scala/github4s/Decoders.scala	84.09% <0%> (-6.82%)	⬇️

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