我正在为一个Flutter项目构建APK，遇到了这个错误。

FAILURE: Build failed with an exception.

* What went wrong:
The Android Gradle plugin supports only Kotlin Gradle plugin version 1.5.20 and higher.
The following dependencies do not satisfy the required version:
project ':location' -> org.jetbrains.kotlin:kotlin-gradle-plugin:1.4.20

* Try:
> Run with --stacktrace option to get the stack trace.
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights.

* Get more help at https://help.gradle.org

我的android/build.gradle文件是

buildscript {
    ext.kotlin_version = '1.7.20'
    repositories {
        google()
        mavenCentral()
    }

    dependencies {
        classpath 'com.android.tools.build:gradle:7.4.0'
        //noinspection DifferentKotlinGradleVersion
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        classpath 'com.google.gms:google-services:4.3.15'
    }
}

allprojects {
    repositories {
        google()
        mavenCentral()
    }
}

rootProject.buildDir = '../build'
subprojects {
    project.buildDir = "${rootProject.buildDir}/${project.name}"
    project.evaluationDependsOn(':app')
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

我找不到需要更改kotlin-gradle插件版本的位置。请帮助。
我尝试更改ext.Kotlin_版本，但似乎没有帮助。