Gradle 8.4: "Convention type has been deprecated"

I upgraded Gradle to version 8.4 and started getting the following types of messages:

The org.gradle.api.plugins.ApplicationPluginConvention type has been deprecated. This is scheduled to be removed in Gradle 9.0. Consult the upgrading guide for further information: https://docs.gradle.org/8.4/userguide/upgrading_version_8.html#application_convention_deprecation

The org.gradle.api.plugins.Convention type has been deprecated. This is scheduled to be removed in Gradle 9.0. Consult the upgrading guide for further information: https://docs.gradle.org/8.4/userguide/upgrading_version_8.html#deprecated_access_to_conventions 

What's going on is that my existing build.gradle files contained some configuration options used in a way that got deprecated. The changes I had to make were largely cosmetic. I just had to group some of the existing configuration options into their own blocks:

I. Pre 8.4:

sourceCompatibility = 1.17
targetCompatibility = 1.17

mainClassName = "run.Main"
applicationDefaultJvmArgs = ["-Xmx1g"]

II. Post 8.4:

java {
  sourceCompatibility = 1.17
  targetCompatibility = 1.17
}

application {
  mainClass.set("run.Main")
  applicationDefaultJvmArgs = ["-Xmx1g"]
}