Upgrade to Nullability Plugin 0.0.9

Closes gh-48638

module/spring-boot-data-couchbase/src/test/java/org/springframework/boot/data/couchbase/domain/city/City.java

@@ -16,6 +16,8 @@
 
 package org.springframework.boot.data.couchbase.domain.city;
 
+import org.jspecify.annotations.Nullable;
+
 import org.springframework.data.annotation.Id;
 import org.springframework.data.couchbase.core.mapping.Document;
 import org.springframework.data.couchbase.core.mapping.Field;
@@ -24,9 +26,9 @@ import org.springframework.data.couchbase.core.mapping.Field;
 public class City {
 
 	@Id
-	private String id;
+	private @Nullable String id;
 
 	@Field
-	private String name;
+	private @Nullable String name;
 
 }

module/spring-boot-data-couchbase/src/test/java/org/springframework/boot/data/couchbase/domain/city/package-info.java

@@ -0,0 +1,20 @@
+/*
+ * Copyright 2012-present the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+@NullMarked
+package org.springframework.boot.data.couchbase.domain.city;
+
+import org.jspecify.annotations.NullMarked;

module/spring-boot-data-couchbase/src/test/java/org/springframework/boot/data/couchbase/domain/empty/package-info.java

@@ -0,0 +1,20 @@
+/*
+ * Copyright 2012-present the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+@NullMarked
+package org.springframework.boot.data.couchbase.domain.empty;
+
+import org.jspecify.annotations.NullMarked;