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, 1 insertions, 1 deletions

diff --git a/opendc-serverless/opendc-serverless-simulator/src/main/kotlin/org/opendc/serverless/simulator/SimFunctionDeployer.kt b/opendc-serverless/opendc-serverless-simulator/src/main/kotlin/org/opendc/serverless/simulator/SimFunctionDeployer.kt
index 0605eaac..b5516b4d 100644
--- a/opendc-serverless/opendc-serverless-simulator/src/main/kotlin/org/opendc/serverless/simulator/SimFunctionDeployer.kt
+++ b/opendc-serverless/opendc-serverless-simulator/src/main/kotlin/org/opendc/serverless/simulator/SimFunctionDeployer.kt
@@ -102,7 +102,7 @@ public class SimFunctionDeployer(
             check(state != FunctionInstanceState.Deleted) { "Function instance has been released" }
             return suspendCancellableCoroutine { cont ->
                 queue.add(InvocationRequest(cont))
-                chan.offer(Unit)
+                chan.trySend(Unit)
             }
         }