Upgrade Kotlin to 1.5.0

[Godin]

No description provided.

[marchof]

@Godin Does the compilation target table in build.html still correctly reflect the correct versions for Kotlin? Looks like Kotlin supports a larger range. And I wonder why we stop by Java 7.

[Godin]

@marchof

Looks like Kotlin supports a larger range. And I wonder why we stop by Java 7.

This like #1181 (comment) is also historical - I think some time ago they didn't had such large range.

Does the compilation target table in build.html still correctly reflect the correct versions for Kotlin?

Table should show what will be generated when bytecode.version not specified depending on JDK version.
And should be generated bytecode.version when it specified.
So you're right - both pom.xml and build.html should be adjusted.

I added such cleanup to this PR few seconds ago. Where I also made specification of groovy.targetBytecode consistent with kotlin.compiler.jvmTarget - more explicit and so IMO more readable/understandable.

[Godin]

@marchof Also Kotlin compiler doesn't support 1.7 and 17 😉

[INFO] --- kotlin-maven-plugin:1.5.0:compile (compile) @ org.jacoco.core.test.validation.kotlin ---
[ERROR] Unknown JVM target version: 1.7
Supported versions: 1.6, 1.8, 9, 10, 11, 12, 13, 14, 15, 16

and 1.6 is deprecated

[INFO] --- kotlin-maven-plugin:1.5.0:compile (compile) @ org.jacoco.core.test.validation.kotlin ---
[WARNING] JVM target 1.6 is deprecated and will be removed in a future release. Please migrate to JVM target 1.8 or above