PROTON-2595: update jacoco to 0.8.8
diff --git a/pom.xml b/pom.xml
index d7641bf..80792af 100644
--- a/pom.xml
+++ b/pom.xml
@@ -40,7 +40,7 @@
 
     <!-- Plugin versions -->
     <maven-bundle-plugin-version>5.1.2</maven-bundle-plugin-version>
-    <jacoco-plugin-version>0.8.7</jacoco-plugin-version>
+    <jacoco-plugin-version>0.8.8</jacoco-plugin-version>
     <surefire.version>2.22.2</surefire.version>
 
     <!-- See also maven.compiler.release in the java9on profile -->