Scala 2.12.20 release notes (DRAFT)

Author: SethTisue

2.12.19.md

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+# Scala 2.12.20 (DRAFT)
+
+This release improves **compatibility**:
+
+* Support JDK 23 in optimizer (via upgrade to patched ASM 9.7.0) ([#10747](https://github.com/scala/scala/pull/10747) by [@Philippus](https://github.com/Philippus))
+* Bump scala-xml dependency to 2.3.0 (was 2.2.0) ([#10782](https://github.com/scala/scala/pull/10782)
+
+and **compiler profiling**:
+
+* [backport] Collect statistics without printing them ([#10798](https://github.com/scala/scala/pull/10798) by [@szeiger](https://github.com/szeiger))
+
+For complete 2.12.20 change lists, see [all merged PRs](https://github.com/scala/scala/pulls?q=is%3Amerged%20milestone%3A2.12.20) and [all closed bugs](https://github.com/scala/bug/issues?utf8=%E2%9C%93&q=is%3Aclosed+milestone%3A2.12.20).
+
+## Compatibility
+
+As usual for our minor releases, Scala 2.12.20 is [binary-compatible](https://docs.scala-lang.org/overviews/core/binary-compatibility-of-scala-releases.html) with the whole Scala 2.12 series.
+
+## Contributors
+
+A big thank you to everyone who's helped improve Scala by reporting bugs, improving our documentation, spreading kindness in discussions around Scala, and submitting and reviewing pull requests! You are all magnificent.
+
+This release was brought to you by 8 contributors, according to `git shortlog -sn --no-merges @ ^v2.12.19`. Thank you Scala Steward, Seth Tisue, Lukas Rytz, A. P. Marki, Hamza Remmal, Philippus Baalman, Stefan Zeiger, nbauma109.
+
+Thanks to [Lightbend](https://www.lightbend.com/scala) for their continued sponsorship of the Scala 2 team’s efforts. Lightbend offers [commercial support](https://www.lightbend.com/lightbend-platform-subscription) for Scala 2.
+
+## Scala 2.12 notes
+
+The [release notes for Scala 2.12.0](https://github.com/scala/scala/releases/v2.12.0) have important information applicable to the whole 2.12 series.
+
+## Obtaining Scala
+
+Scala releases are available through a variety of channels, including (but not limited to):
+
+* Bump the `scalaVersion` setting in your sbt project
+* Bump the `using scala` setting in your Scala CLI project
+* Download a distribution from [scala-lang.org](https://scala-lang.org/download/2.12.20.html)
+* Obtain JARs via [Maven Central](https://search.maven.org/search?q=g:org.scala-lang%20AND%20v:2.12.20)