chore: upgrade sbt 1.9.7

Motivation:

Gatling 3.10 baseline is moving to Java 11.
CI is upgraded to Java 21.

.github/workflows/build.yml

@@ -40,7 +40,7 @@ jobs:
         uses: actions/setup-java@v2
         with:
           distribution: 'zulu'
-          java-version: '8'
+          java-version: '21'
 
       - name: Cache SBT
         uses: actions/cache@v2

.github/workflows/create-release.yml

@@ -35,7 +35,7 @@ jobs:
         uses: actions/setup-java@v2
         with:
           distribution: 'zulu'
-          java-version: '8'
+          java-version: '21'
 
       - name: Cache SBT
         uses: actions/cache@v2

.github/workflows/release.yml

@@ -24,7 +24,7 @@ jobs:
         uses: actions/setup-java@v2
         with:
           distribution: 'zulu'
-          java-version: '8'
+          java-version: '21'
 
       - name: Prepare environment
         env:

project/BuildSettings.scala

@@ -3,13 +3,15 @@ import io.gatling.build.license.Apache2LicenseFilePlugin.Apache2LicenseFileKeys.
 import sbt._
 import sbt.Keys._
 import de.heikoseeberger.sbtheader.HeaderPlugin.autoImport._
+import _root_.io.gatling.build.compile.GatlingCompilerSettingsPlugin.GatlingCompilerSettingsKey._
 
 object BuildSettings {
   lazy val basicSettings = Seq(
     organization := "io.gatling.highcharts",
     headerLicense := GatlingHighChartsLicense,
     licenses := Seq("Gatling Highcharts" -> url("https://raw.githubusercontent.com/gatling/gatling-highcharts/master/LICENSE")),
+    gatlingCompilerRelease := Some(11),
     // Avoid to write the Apache2 license
-    Compile / gatlingApache2LicenseTask := Seq.empty
+    Compile / gatlingApache2LicenseTask := Nil
   )
 }

project/plugins.sbt

@@ -1,3 +1,3 @@
-addSbtPlugin("io.gatling"      % "gatling-build-plugin" % "5.2.1")
+addSbtPlugin("io.gatling"      % "gatling-build-plugin" % "5.3.0")
 addSbtPlugin("com.github.sbt"  % "sbt-native-packager"  % "1.9.16")
-addSbtPlugin("org.wartremover" % "sbt-wartremover"      % "3.1.4")
+addSbtPlugin("org.wartremover" % "sbt-wartremover"      % "3.1.5")