Bump maven-compiler-plugin to 3.8.1

Author: rbygrave

http-generator-client/pom.xml

@@ -30,7 +30,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-compiler-plugin</artifactId>
-        <version>3.2</version>
+        <version>3.8.1</version>
         <configuration>
           <source>11</source>
           <target>11</target>

http-generator-core/pom.xml

@@ -61,7 +61,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-compiler-plugin</artifactId>
-        <version>3.2</version>
+        <version>3.8.1</version>
         <configuration>
           <source>1.8</source>
           <target>1.8</target>

http-generator-helidon/pom.xml

@@ -27,7 +27,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-compiler-plugin</artifactId>
-        <version>3.2</version>
+        <version>3.8.1</version>
         <configuration>
           <source>1.8</source>
           <target>1.8</target>

http-generator-javalin/pom.xml

@@ -27,7 +27,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-compiler-plugin</artifactId>
-        <version>3.2</version>
+        <version>3.8.1</version>
         <configuration>
           <source>1.8</source>
           <target>1.8</target>

http-generator-jex/pom.xml

@@ -27,7 +27,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-compiler-plugin</artifactId>
-        <version>3.2</version>
+        <version>3.8.1</version>
         <configuration>
           <source>1.8</source>
           <target>1.8</target>

http-generator-spark/pom.xml

@@ -28,7 +28,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-compiler-plugin</artifactId>
-        <version>3.2</version>
+        <version>3.8.1</version>
         <configuration>
           <source>1.8</source>
           <target>1.8</target>