util: crossbuild with the Scala 3.0.2-RC1

Problem:

The Scala 3.0.1 compiler includes bugs that are patched
in the 3.0.2-RC1 release. An example of this is the broken
Java APIs in JDK 11 for our `TimeLikeOps` classes because of
scala/scala3#13039.

Result / Solution:
Using the 3.0.2-RC1 release doesn't break any tests and our
projects compile fine. Let's update to this to make use of the bug
fixes until the 3.0.2 is officially released.

The new Dotty scaladoc requires network access due to a bug
scala/scala3#13272. For now let's
disable scaladoc for scala 3.

JIRA Issues: CSL-11235

Differential Revision: https://phabricator.twitter.biz/D720887

Author: hamdiallam

CHANGELOG.rst

@@ -44,8 +44,7 @@ New Features
 * util-core: Experimentally crossbuilds with Scala 3. ``PHAB_ID=D694775``
 
 * util-core (BREAKING): Remove `AbstractSpool`. Java users should use `Spools` static class or
-  the Spool companion object to create instances of `Spool`.
-
+  the Spool companion object to create instances of `Spool`. ``PHAB_ID=D694775``
 
 Runtime Behavior Changes
 ~~~~~~~~~~~~~~~~~~~~~~~~

build.sbt

@@ -89,7 +89,7 @@ val defaultScalaSettings = Seq(
 )
 val defaultScala3EnabledSettings = Seq(
   scalaVersion := _scalaVersion,
-  crossScalaVersions := _crossScalaVersions ++ Seq("3.0.1")
+  crossScalaVersions := _crossScalaVersions ++ Seq("3.0.2-RC1")
 )
 
 // Our dependencies or compiler options may differ for both Scala 2 and 3. We branch here
@@ -132,6 +132,16 @@ val baseSettings = Seq(
       case _ => sourceDir / "scala-2.13+"
     }
   },
+  // Let's skip compiling docs for Scala 3 due a Dotty Scaladoc bug where generating the docs
+  // requires network access. See https://github.com/lampepfl/dotty/issues/13272 or CSL-11251.
+  Compile / doc / sources := {
+    if (scalaVersion.value.startsWith("3")) Seq.empty
+    else (Compile / doc / sources).value
+  },
+  Compile / packageDoc / publishArtifact := {
+    if (scalaVersion.value.startsWith("3")) false
+    else (Compile / packageDoc / publishArtifact).value
+  },
   ScoverageKeys.coverageHighlighting := true,
   resolvers +=
     "Sonatype OSS Snapshots" at "https://oss.sonatype.org/content/repositories/snapshots",