Update build dependency with the latest Variant API supported

[cdsap]

Once we updated the AGP version in the classpath to 7.3.1, we still need to point to the latest stable version of the AGP.
https://github.com/gradle/android-cache-fix-gradle-plugin/blob/main/build.gradle#L26

The new variant API is available in recent versions and it's a pre-requisite to start reworking the workaround variant logic with types provided in the new API.
The old variant is going to be removed in AGP 9.

[runningcode]

@cdsap is there anything else we need to do here?

[runningcode]

Can you check if we still have usages of the Variant API?

[cdsap]

Hi, we have still the JdkImageWorkaround with references like:

            android.unitTestVariants.all(configureVariant)
            android.applicationVariants.all(configureVariant)

https://github.com/gradle/android-cache-fix-gradle-plugin/blob/main/src/main/groovy/org/gradle/android/workarounds/JdkImageWorkaround.groovy#L66