Start building against Spring Framework 6.0.10 snapshots

This reverts commit bc63c51 as Framework's previous behavior has
been restored.

See gh-35751

gradle.properties

@@ -6,7 +6,7 @@ org.gradle.jvmargs=-Xmx2g -Dfile.encoding=UTF-8
 
 kotlinVersion=1.8.21
 nativeBuildToolsVersion=0.9.22
-springFrameworkVersion=6.0.9
+springFrameworkVersion=6.0.10-SNAPSHOT
 tomcatVersion=10.1.8
 
 kotlin.stdlib.default.dependency=false

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/context/properties/bind/MapBinderTests.java

@@ -24,7 +24,6 @@
 import java.util.List;
 import java.util.Map;
 import java.util.Properties;
-import java.util.SortedMap;
 import java.util.stream.Collectors;
 
 import org.junit.jupiter.api.Test;
@@ -245,7 +244,7 @@ void bindToMapWhenHasExistingMapShouldReplaceOnlyNewContents() {
 		existing.put("baz", 1001);
 		Bindable<Map<String, Integer>> target = STRING_INTEGER_MAP.withExistingValue(existing);
 		Map<String, Integer> result = this.binder.bind("foo", target).get();
-		assertThat(result).isInstanceOf(HashMap.class);
+		assertThat(result).isExactlyInstanceOf(HashMap.class);
 		assertThat(result).hasSize(2);
 		assertThat(result).containsEntry("bar", 1);
 		assertThat(result).containsEntry("baz", 1001);
@@ -254,10 +253,10 @@ void bindToMapWhenHasExistingMapShouldReplaceOnlyNewContents() {
 	@Test
 	void bindToMapShouldRespectMapType() {
 		this.sources.add(new MockConfigurationPropertySource("foo.bar", "1"));
-		ResolvableType type = ResolvableType.forClassWithGenerics(SortedMap.class, String.class, Integer.class);
+		ResolvableType type = ResolvableType.forClassWithGenerics(HashMap.class, String.class, Integer.class);
 		Object defaultMap = this.binder.bind("foo", STRING_INTEGER_MAP).get();
 		Object customMap = this.binder.bind("foo", Bindable.of(type)).get();
-		assertThat(customMap).isInstanceOf(SortedMap.class).isNotInstanceOf(defaultMap.getClass());
+		assertThat(customMap).isExactlyInstanceOf(HashMap.class).isNotInstanceOf(defaultMap.getClass());
 	}
 
 	@Test