For the sake of simplicity, one should better use the base plugin.
This Kotlin script reads String from gradle/libs.versions.toml:

[versions]
app_versionName = "1.0.0"

And applies it to all the output packages, no matter if APK or AAB ...

base {
    val versionName: String = libs.versions.app.versionName.get()
    archivesName = "SomeApp_$versionName"
}
android { ... }

Which basically means, that it is not required to rename anything.
This also works fine with build-types and product-flavors, by default.
One can avoid some moving, when changing the value of buildDir.

---

However, one can as well move and rename files, in case this should be required. I've wrote an Exec task in Groovy for cross-platform CLI execution, no matter what the commandLine is. My RenameTask can detect Linux, Mac & Windows, as well as release & debug.

Property archivesBaseName needs to be defined in defaultConfig:

android {
    defaultConfig {
        setProperty("archivesBaseName", "SomeApp_" + "1.0.0")
    }
}

RenameTask extends Exec performs the renaming (not to be confused with type: Rename):

import javax.inject.Inject

/**
 * App Bundle RenameTask
 * @author Martin Zeitler
**/
class RenameTask extends Exec {
    private String buildType
    @Inject RenameTask(String value) {this.setBuildType(value)}
    @Input String getBuildType() {return this.buildType}
    void setBuildType(String value) {this.buildType = value}
    @Override
    @TaskAction
    void exec() {
        def baseName = getProject().getProperty('archivesBaseName')
        def basePath = getProject().getProjectDir().getAbsolutePath()
        def bundlePath = "${basePath}/build/outputs/bundle/${this.getBuildType()}"
        def srcFile = "${bundlePath}/${baseName}-${this.getBuildType()}.aab"
        def dstFile = "${bundlePath}/${baseName}.aab"
        def os = org.gradle.internal.os.OperatingSystem.current()
        if (os.isUnix() || os.isLinux() || os.isMacOsX()) {
            commandLine "mv -v ${srcFile} ${dstFile}".split(" ")
        } else if (os.isWindows()) {
            commandLine "ren ${srcFile} ${dstFile}".split(" ")
        } else {
            throw new GradleException("Cannot move AAB with ${os.getName()}.")
        }
        super.exec()
    }
}

And it finalizes two other tasks:

// it defines tasks :renameBundleRelease & :renameBundleDebug
task renameBundleRelease(type: RenameTask, constructorArgs: ['release'])
task renameBundleDebug(type: RenameTask, constructorArgs: ['debug'])

// it sets finalizedBy for :bundleRelease & :bundleDebug
tasks.whenTaskAdded { task ->
    switch (task.name) {
        case 'bundleRelease': task.finalizedBy renameBundleRelease; break
        case   'bundleDebug': task.finalizedBy renameBundleDebug; break
    }
}

---

However, in most cases the base plugin might already suffice.
One can set archivesName - but one cannot move files around.

base {
    archivesName = "someapp_${libs.versions.app.version.name.get()}"
}