[Renovate Bot] Update tested AGP versions to v8.12.0-alpha09 (#1848)

This PR contains the following updates:

| Package | Change | Age | Confidence |
|---|---|---|---|
|
[com.android.tools.build:gradle](https://developer.android.com/studio/build)
([source](https://android.googlesource.com/platform/tools/base)) |
`8.12.0-alpha08` -> `8.12.0-alpha09` |
[![age](https://developer.mend.io/api/mc/badges/age/maven/com.android.tools.build:gradle/8.12.0-alpha09?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/maven/com.android.tools.build:gradle/8.12.0-alpha08/8.12.0-alpha09?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

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Author: clayburn

gradle.properties

@@ -6,4 +6,4 @@ org.gradle.kotlin.dsl.allWarningsAsErrors=true
 
 systemProp.pts.enabled=true
 
-org.gradle.android.latestKnownAgpVersion=8.12.0-alpha08
+org.gradle.android.latestKnownAgpVersion=8.12.0-alpha09

src/test/resources/versions.json

@@ -1,6 +1,6 @@
 {
     "testedVersions": {
-        "8.12.0-alpha08": [
+        "8.12.0-alpha09": [
             "8.14"
         ],
         "8.11.1": [