Update scala-compiler to 2.13.18

[scala-steward]

About this PR

📦 Updates org.scala-lang:scala-compiler from 2.13.16 to 2.13.18

📜 GitHub Release Notes - Version Diff

Usage

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🔍 Files still referring to the old version number

The following files still refer to the old version number (2.13.16).
You might want to review and update them manually.

internal/zinc-core/src/main/scala/sbt/internal/inc/RootPath.scala

⚙ Adjust future updates

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

updates.ignore = [ { groupId = "org.scala-lang", artifactId = "scala-compiler" } ]

Or, add this to slow down future updates of this dependency:

dependencyOverrides = [{
  pullRequests = { frequency = "30 days" },
  dependency = { groupId = "org.scala-lang", artifactId = "scala-compiler" }
}]

^{labels: library-update, early-semver-patch, semver-spec-patch, old-version-remains, commit-count:1}

[mkurz]

How can the failing tests be fixed?

$ grep -r --exclude-dir=.git --exclude-dir=target '2\.13\.1'
internal/zinc-benchmarks/src/test/scala/xsbt/ZincBenchmark.scala:  val scalaVersion = "2.13.18"
internal/compiler-bridge-test/src/test/scala/sbt/internal/inc/CompilingSpecification.scala:  def scala213 = "2.13.18"
project/Dependencies.scala:  val scala213 = "2.13.18"
project/Dependencies.scala:  val scala213ForBridge = "2.13.18"

I can not see were 2.13.16 can be bumped.
I guess some external dep needs to be updated? Or sbt itsel needs to bump to 2.13.18 before?

[eed3si9n]

How can the failing tests be fixed?

I think in theory the diff should have worked? Bumping to 2.13.16 was automatic - #1530. Also given that Scala 2.13 has in-sourced the bridge implementation, I'm also not sure if we should bump the 2.13 version used to test our bridge implementation.