Make File/Path tests pass on Windows

See gh-30806

spring-core/src/test/java/org/springframework/util/ObjectUtilsTests.java

@@ -937,10 +937,10 @@ class ObjectUtilsTests {
 
 		@Test
 		void nullSafeConciseToStringForFile() {
-			String path = "/tmp/file.txt";
+			String path = "/tmp/file.txt".replace('/', File.separatorChar);
 			assertThat(ObjectUtils.nullSafeConciseToString(new File(path))).isEqualTo(path);
 
-			path =  "/tmp/" + "xyz".repeat(32);
+			path = ("/tmp/" + "xyz".repeat(32)).replace('/', File.separatorChar);
 			assertThat(ObjectUtils.nullSafeConciseToString(new File(path)))
 					.hasSize(truncatedLength)
 					.startsWith(path.subSequence(0, 100))
@@ -949,10 +949,10 @@ class ObjectUtilsTests {
 
 		@Test
 		void nullSafeConciseToStringForPath() {
-			String path = "/tmp/file.txt";
+			String path = "/tmp/file.txt".replace('/', File.separatorChar);
 			assertThat(ObjectUtils.nullSafeConciseToString(Path.of(path))).isEqualTo(path);
 
-			path =  "/tmp/" + "xyz".repeat(32);
+			path = ("/tmp/" + "xyz".repeat(32)).replace('/', File.separatorChar);
 			assertThat(ObjectUtils.nullSafeConciseToString(Path.of(path)))
 					.hasSize(truncatedLength)
 					.startsWith(path.subSequence(0, 100))