Expect a platform path in the git diff parsing test

With the fixture read as LF, the second Windows run parsed both files, and the test failed only on how it wrote the expected path: SingleFileDiff keeps a Path, which prints with backslashes on Windows. The expected string now builds that path with Path.of, so it prints the platform's way on every system.

Author: abashev

gradle-open-java-format/src/test/java/com/palantir/javaformat/gradle/FormatDiffTest.java

@@ -62,8 +62,9 @@ void parsing_git_diff_output_works() throws IOException {
         assertThat(strings)
                 .containsExactly(
                         "SingleFileDiff{path=build.gradle, lineRanges=[[24..25), [29..30)]}",
-                        "SingleFileDiff{path=tracing/src/test/java/com/palantir/tracing/TracersTest.java, "
-                                + "lineRanges=[[659..660), [675..676)]}");
+                        // The path is a Path, which prints with backslashes on Windows.
+                        "SingleFileDiff{path=" + Path.of("tracing/src/test/java/com/palantir/tracing/TracersTest.java")
+                                + ", lineRanges=[[659..660), [675..676)]}");
     }
 
     @ParameterizedTest