Draft release notes

Author: retronym

releases/2.12.14.md

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+Scala 2.12.14:
+  * Backports improvements to `-Xsource:3` to help projects cross build between 2.12.x, 2.13.x and 3.x. 
+    ([#9589](https://github.com/scala/scala/pull/9589), [#9595](https://github.com/scala/scala/pull/9595) and [#9620](https://github.com/scala/scala/pull/9620) by [@smarter](https://github.com/smarter) and [@neko-kai](https://github.com/neko-kai))
+  * Reduces lock contention between compilers when reading classpath JAR files. ([#9549](https://github.com/scala/scala/pull/9549) by [@retronym](https://github.com/retronym))
+  * Propagate custom `TaskSupport` through operations of parallel collections. ([#9529](https://github.com/scala/scala/pull/9529), backport of fix for [scala/scala-parallel-collections#152](https://github.com/scala/scala-parallel-collections/issues/152), by [@lrytz](https://github.com/lrytz)) 
+  * Update version of ASM dependency, enabling interop with Java 17-compiled classes. ([#9488](https://github.com/scala/scala/pull/9488) by [@sethtisue](https://github.com/sethtisue))
+  * Allow annotated literals inside as annotation args. ([#9342](https://github.com/scala/scala/pull/9342) by [@gzm0](https://github.com/gzm0))
+
+For complete 2.12.14 change lists, see [all merged PRs](https://github.com/scala/scala/pulls?q=is%3Amerged%20milestone%3A2.12.14) and [all closed bugs](https://github.com/scala/bug/issues?utf8=%E2%9C%93&q=is%3Aclosed+milestone%3A2.12.14).
+
+## Compatibility
+
+As usual for our minor releases, Scala 2.12.14 is binary-compatible 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 40 contributors, according to `git shortlog -sn --no-merges HEAD ^v2.12.13 ^2.11.x`. Thank you Jason Zaugg, Lukas Rytz, Guillaume Martres, Dale Wijnand, Seth Tisue, A. P. Marki, Mike Skells, Tom Grigg, Kai, Mario Galic, Martijn Hoekstra, tanishiking, Philippus, Adriaan Moors, Sébastien Doeraene, Tobias Schlatter, Andrii, Filipe Regadas, Alexey Kotlyarov.
+
+Thanks to [Lightbend](https://www.lightbend.com/scala) for their continued sponsorship of the Scala core team’s efforts. Lightbend offers [commercial support](https://www.lightbend.com/lightbend-platform-subscription) for Scala.
+
+## 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-based project
+* Download a distribution from [scala-lang.org](http://scala-lang.org/download/2.12.14.html)
+* Obtain JARs via [Maven Central](http://search.maven.org/#search%7Cga%7C1%7Cg%3A%22org.scala-lang%22%20AND%20v%3A%222.12.14%22)