Update sbt-microsites to 0.9.1

[scala-steward]

Updates com.47deg:sbt-microsites from 0.7.27 to 0.9.1.

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 @scala-steward 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 = "com.47deg", artifactId = "sbt-microsites" }]

labels: semver-minor

[codecov-io]

Codecov Report

Merging #2906 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2906   +/-   ##
=======================================
  Coverage   94.26%   94.26%           
=======================================
  Files         363      363           
  Lines        6945     6945           
  Branches      181      181           
=======================================
  Hits         6547     6547           
  Misses        398      398

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