Bump scala version to 2.12.13

Problem/Solution

Bumping scala version to 2.12.13

JIRA Issues: SCALA-25

Differential Revision: https://phabricator.twitter.biz/D632567

CHANGELOG.rst

@@ -34,6 +34,8 @@ Breaking API Changes
 Runtime Behavior Changes
 ~~~~~~~~~~~~~~~~~~~~~~~~
 
+* finagle: Bump scala version to 2.12.13 ``PHAB_ID=D632567``
+
 * finagle-core: Move helper tracing methods like `traceLocal` in `Trace` into the `Tracing` class. This
   allows cheaper use of these APIs by first capturing a Trace via `Trace#apply`, avoiding the extra lookups
   that will add overhead on the request path. ``PHAB_ID=D633318``.

build.sbt

@@ -138,8 +138,8 @@ def jdk11GcJavaOptions: Seq[String] = {
 val sharedSettings = Seq(
   version := releaseVersion,
   organization := "com.twitter",
-  scalaVersion := "2.12.11",
-  crossScalaVersions := Seq("2.12.11", "2.13.1"),
+  scalaVersion := "2.12.13",
+  crossScalaVersions := Seq("2.12.13", "2.13.1"),
   fork in Test := true, // We have to fork to get the JavaOptions
   libraryDependencies ++= Seq(
     // See https://www.scala-sbt.org/0.13/docs/Testing.html#JUnit

doc/src/sphinx/code/client-server-anatomy/build.sbt

@@ -2,7 +2,7 @@ name := "client-server-anatomy"
 
 version := "1.0"
 
-scalaVersion := "2.12.11"
+scalaVersion := "2.12.13"
 
 libraryDependencies ++= Seq(
   "com.twitter" %% "finagle-core" % "21.2.0"

doc/src/sphinx/code/protocols/build.sbt

@@ -2,7 +2,7 @@ name := "protocols"
 
 version := "1.0"
 
-scalaVersion := "2.12.11"
+scalaVersion := "2.12.13"
 
 libraryDependencies ++= Seq(
   "com.twitter" %% "finagle-mysql" % "21.2.0"

doc/src/sphinx/code/quickstart/build.sbt

@@ -2,7 +2,7 @@ lazy val root = (project in file(".")).
   settings(
     inThisBuild(List(
       organization := "com.twitter",
-      scalaVersion := "2.12.11",
+      scalaVersion := "2.12.13",
       version      := "1.0"
     )),
     name := "quickstart",