Fix test compilation warnings

Closes gh-30753

spring-aop/spring-aop.gradle

@@ -10,4 +10,5 @@ dependencies {
 	testImplementation(testFixtures(project(":spring-core")))
 	testFixturesImplementation(testFixtures(project(":spring-beans")))
 	testFixturesImplementation(testFixtures(project(":spring-core")))
+	testFixturesImplementation("com.google.code.findbugs:jsr305")
 }

spring-beans/spring-beans.gradle

@@ -14,4 +14,5 @@ dependencies {
 	testImplementation("jakarta.annotation:jakarta.annotation-api")
 	testFixturesApi("org.junit.jupiter:junit-jupiter-api")
 	testFixturesImplementation("org.assertj:assertj-core")
+	testFixturesImplementation("com.google.code.findbugs:jsr305")
 }

spring-beans/src/test/java/org/springframework/beans/AbstractPropertyAccessorTests.java

@@ -1994,6 +1994,7 @@ abstract class AbstractPropertyAccessorTests {
 
 	}
 
+	@SuppressWarnings("unchecked")
 	static class Spr13837Bean implements Spr13837 {
 
 		protected Integer something;
@@ -2004,7 +2005,6 @@ abstract class AbstractPropertyAccessorTests {
 		}
 
 		@Override
-		@SuppressWarnings("unchecked")
 		public Spr13837Bean setSomething(final Integer something) {
 			this.something = something;
 			return this;

spring-beans/src/test/java/org/springframework/beans/factory/DefaultListableBeanFactoryTests.java

@@ -3190,6 +3190,7 @@ class DefaultListableBeanFactoryTests {
 	}
 
 
+	@SuppressWarnings({ "unchecked", "rawtypes" })
 	private static class CustomTypeConverter implements TypeConverter {
 
 		private final NumberFormat numberFormat;
@@ -3199,7 +3200,6 @@ class DefaultListableBeanFactoryTests {
 		}
 
 		@Override
-		@SuppressWarnings({ "unchecked", "rawtypes" })
 		public Object convertIfNecessary(Object value, @Nullable Class requiredType) {
 			if (value instanceof String && Float.class.isAssignableFrom(requiredType)) {
 				try {
@@ -3218,13 +3218,11 @@ class DefaultListableBeanFactoryTests {
 		}
 
 		@Override
-		@SuppressWarnings({ "unchecked", "rawtypes" })
 		public Object convertIfNecessary(Object value, @Nullable Class requiredType, @Nullable MethodParameter methodParam) {
 			return convertIfNecessary(value, requiredType);
 		}
 
 		@Override
-		@SuppressWarnings({ "unchecked", "rawtypes" })
 		public Object convertIfNecessary(Object value, @Nullable Class requiredType, @Nullable Field field) {
 			return convertIfNecessary(value, requiredType);
 		}