[releng] Update plexus-compiler to 2.8.7

Change-Id: Idc00c877544af7434c3a71c9ab0b2bd6a2b8fb66
Signed-off-by: Thomas Wolf <thomas.wolf@paranor.ch>
diff --git a/pom.xml b/pom.xml
index 2482617..d102b3f 100644
--- a/pom.xml
+++ b/pom.xml
@@ -178,6 +178,7 @@
     <maven-surefire-plugin-version>3.0.0-M4</maven-surefire-plugin-version>
     <maven-surefire-report-plugin-version>${maven-surefire-plugin-version}</maven-surefire-report-plugin-version>
     <maven-compiler-plugin-version>3.8.1</maven-compiler-plugin-version>
+    <plexus-compiler-version>2.8.7</plexus-compiler-version>
 
     <!-- Properties to enable jacoco code coverage analysis -->
     <sonar.core.codeCoveragePlugin>jacoco</sonar.core.codeCoveragePlugin>
@@ -846,12 +847,12 @@
               <dependency>
                 <groupId>org.codehaus.plexus</groupId>
                 <artifactId>plexus-compiler-javac</artifactId>
-                <version>2.8.6</version>
+                <version>${plexus-compiler-version}</version>
               </dependency>
               <dependency>
                 <groupId>org.codehaus.plexus</groupId>
                 <artifactId>plexus-compiler-javac-errorprone</artifactId>
-                <version>2.8.6</version>
+                <version>${plexus-compiler-version}</version>
               </dependency>
               <!-- override plexus-compiler-javac-errorprone's dependency on
                   Error Prone with the latest version -->
@@ -890,7 +891,7 @@
               <dependency>
                 <groupId>org.codehaus.plexus</groupId>
                 <artifactId>plexus-compiler-eclipse</artifactId>
-                <version>2.8.6</version>
+                <version>${plexus-compiler-version}</version>
               </dependency>
               <dependency>
                 <groupId>org.eclipse.jdt</groupId>