Remove unnecessary defensive path separator

Co-authored-by: Brice Dutheil <brice.dutheil@gmail.com>

Author: Matt

internal-api/src/main/java/datadog/trace/util/PidHelper.java

@@ -101,7 +101,7 @@ public static Set<String> getJavaPids() {
     try (Stream<Path> stream =
        // Emulating the hotspot way to enumerate the JVM processes using the perfdata file
        // https://github.com/openjdk/jdk/blob/d7cb933b89839b692f5562aeeb92076cd25a99f6/src/hotspot/share/runtime/perfMemory.cpp#L244
-        Files.list(Paths.get(getOSTempDir() + "/hsperfdata_" + System.getProperty("user.name")))) {
+        Files.list(Paths.get(getOSTempDir(), "hsperfdata_" + System.getProperty("user.name")))) {
       return stream
           .filter(file -> !Files.isDirectory(file))
           .map(Path::getFileName)