build: Add support for Java 16

This pull request adds support for building OpenDC using Java 16. 

To make this possible, we have upgraded the following dependencies:
- Kotlin from 1.4.3 to 1.5.0
- Jacoco from 0.8.6 to 0.8.7
- Gradle from 7.0 to 7.0.2

1 files changed, 7 insertions, 0 deletions

diff --git a/buildSrc/src/main/kotlin/jacoco-aggregation.gradle.kts b/buildSrc/src/main/kotlin/jacoco-aggregation.gradle.kts
index 3e8aa741..1ea5de4c 100644
--- a/buildSrc/src/main/kotlin/jacoco-aggregation.gradle.kts
+++ b/buildSrc/src/main/kotlin/jacoco-aggregation.gradle.kts
@@ -1,3 +1,5 @@
+import gradle.kotlin.dsl.accessors._a850a9ab866951e91ee43960bbc39582.jacoco
+
 /*
  * MIT License
  *
@@ -32,6 +34,11 @@ repositories {
     mavenCentral()
 }
 
+jacoco {
+    // Necessary for Kotlin 1.5.0. See https://github.com/jacoco/jacoco/issues/1155
+    toolVersion = "0.8.7"
+}
+
 tasks.register<JacocoReport>("codeCoverageReport") {
     group = "Coverage reports"
     description = "Generates an aggregate report based on all subprojects"