[Scala] Add target JVM 8

Author: gaeljw

scala/scala_2.11/pom.xml

@@ -59,6 +59,14 @@
             </testResource>
         </testResources>
         <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <source>1.8</source>
+                    <target>1.8</target>
+                </configuration>
+            </plugin>
             <!-- Extra Sources for Scala 2.11 -->
             <plugin>
                 <groupId>org.codehaus.mojo</groupId>
@@ -82,6 +90,7 @@
                 <artifactId>scala-maven-plugin</artifactId>
                 <configuration>
                     <args>
+                        <arg>-target:jvm-1.8</arg>
                         <arg>-deprecation</arg>
                         <arg>-feature</arg>
                         <!-- Allow definition of implicit functions called views -->

scala/scala_2.12/pom.xml

@@ -73,6 +73,7 @@
                 <artifactId>scala-maven-plugin</artifactId>
                 <configuration>
                     <args>
+                        <arg>-target:jvm-1.8</arg>
                         <!-- Emit warning and location for usages of deprecated APIs. -->
                         <arg>-deprecation</arg>
                         <!-- Emit warning and location for usages of features that should be imported explicitly. -->

scala/scala_2.13/pom.xml

@@ -70,6 +70,7 @@
                 <configuration>
                     <!-- https://nathankleyn.com/2019/05/13/recommended-scalac-flags-for-2-13/ -->
                     <args>
+                        <arg>-target:jvm-1.8</arg>
                         <!-- Emit warning and location for usages of deprecated APIs. -->
                         <arg>-deprecation</arg>
                         <!-- Explain type errors in more detail. -->