Fix gradle version for 1.7.0-alpha01

#cherrypick

PiperOrigin-RevId: 759217161

Author: icbaker

constants.gradle

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 project.ext {
-    releaseVersion = '1.7.0'
+    releaseVersion = '1.7.0-alpha01'
     releaseVersionCode = 1_007_000_0_01
     minSdkVersion = 21
     // See https://developer.android.com/training/cars/media/automotive-os#automotive-module