Update sbt-scalajs, scalajs-compiler, scalajs-library... to 0.6.26

[scala-steward]

Updates

• org.scala-js:sbt-scalajs
• org.scala-js:scalajs-compiler
• org.scala-js:scalajs-library
• org.scala-js:scalajs-test-interface

from 0.6.25 to 0.6.26.

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 nice day!