fix: update EmbeddingModelDiscoveryTest package statement

PiperOrigin-RevId: 846265401

Author: google-genai-bot

contrib/spring-ai/src/test/java/com/google/adk/models/springai/embeddings/EmbeddingModelDiscoveryTest.java

@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package com.google.adk.models.springai;
+package com.google.adk.models.springai.embeddings;
 
 import static org.assertj.core.api.Assertions.assertThat;