Bump references to Android Gradle plugin from 8.6.0-alpha05 to 8.6.0-alpha08 (#725)

This PR bumps references to Android Gradle plugin from 8.6.0-alpha05 to
8.6.0-alpha08.

Author: runningcode

src/main/resources/versions.json

@@ -1,6 +1,6 @@
 {
     "supportedVersions": {
-        "8.6.0-alpha05": [
+        "8.6.0-alpha08": [
             "8.8"
         ],
         "8.5.0": [

src/test/groovy/org/gradle/android/WorkaroundTest.groovy

@@ -12,7 +12,7 @@ class WorkaroundTest extends Specification {
         workarounds.collect { it.class.simpleName.replaceAll(/Workaround/, "") }.sort() == expectedWorkarounds.sort()
         where:
         androidVersion  | expectedWorkarounds
-        "8.6.0-alpha05" | ['JdkImage']
+        "8.6.0-alpha08" | ['JdkImage']
         "8.5.0"         | ['JdkImage']
         "8.4.1"         | ['JdkImage']
         "8.3.2"         | ['MergeSourceSetFolders', 'JdkImage']