Update sbt, scripted-plugin to 1.3.0

[scala-steward]

Updates

• org.scala-sbt:sbt
• org.scala-sbt:scripted-plugin

from 1.2.8 to 1.3.0.

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

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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.scala-sbt" } ]

labels: semver-minor

[pvlugter]

Not sure if those scripted tests need their own sbt version defined, but otherwise seems good to make the bump to sbt 1.3 now.

[raboof]

(this means new versions of paradox will no longer support sbt 1.2.8 - that might be fine? sbt/sbt#5049)