Update discipline-core to 1.2.0 in series/0.22

[scala-steward]

Updates org.typelevel:discipline-core from 1.1.5 to 1.2.0.
GitHub Release Notes - Version Diff

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

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Files still referring to the old version number

The following files still refer to the old version number (1.1.5).
You might want to review and update them manually.

core/src/main/scala/org/http4s/headers/Content-Type.scala
website/src/hugo/content/changelog.md

Ignore future updates

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

updates.ignore = [ { groupId = "org.typelevel", artifactId = "discipline-core" } ]

labels: library-update, semver-minor, old-version-remains

[rossabaker]

I'd like to see the expert consensus on typelevel/cats#4018, but I think what discipline does with its Scala.js is of no consequence to us. Probably yes on this.

[armanbilge]

Yeah, the ship has almost definitely sailed on this already since we're already on SJS 1.7.x. For us to rollback to 1.5.x like cats (if this is even possible!) would require rolling back tons of projects, including CE3, fs2, scala-js-macrotask-executor, ..., and not updating discipline.

[rossabaker]

Yeah, if a rollback by us is not both safe and isolated, there's no reason to hold this back.