update jacoco for Java 15/16 support (#11361)

diff --git a/pom.xml b/pom.xml
index 7584bc5..3022069 100644
--- a/pom.xml
+++ b/pom.xml
@@ -110,7 +110,7 @@
         <powermock.version>2.0.9</powermock.version>
         <aws.sdk.version>1.11.884</aws.sdk.version>
         <caffeine.version>2.8.0</caffeine.version>
-        <jacoco.version>0.8.6</jacoco.version>
+        <jacoco.version>0.8.7</jacoco.version>
         <!-- When upgrading ZK, edit docs and integration tests as well (integration-tests/docker-base/setup.sh) -->
         <zookeeper.version>3.5.9</zookeeper.version>
         <checkerframework.version>2.5.7</checkerframework.version>