Update Scala 2.12 to 2.12.9

[jhnsmth]

No description provided.

[LukaJCB]

Thank you :)

[jhnsmth]

CI failure seems unrelated...

[codecov-io]

Codecov Report

Merging #2978 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2978   +/-   ##
=======================================
  Coverage   93.84%   93.84%           
=======================================
  Files         369      369           
  Lines        7067     7067           
  Branches      195      195           
=======================================
  Hits         6632     6632           
  Misses        435      435

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[kailuowang]

hi, @jhnsmth thanks for the PR.
BTW, you didn't have to close and reopen the PR to trigger the CI build. Maintainers can rerun the single failed job.

[takayahilton]

scala/bug#11665
we should wait until the release of 2.12.10 ?

[djspiewak]

@takayahilton Not sure that bug is relevant to cats, given that we don't really use string interpolation very much. It's possible though.

[rossabaker]

The string interp bug also won't be passed transitively to our users, as might happen in a regular dependency.