Fix thread safety issue in ThreadedScanJobExecutor

Fixed MT_CORRECTNESS/AT_STALE_THREAD_WRITE_OF_PRIMITIVE issue where
finishedProbes counter was not thread-safe. Changed finishedProbes
from a primitive int to AtomicInteger to ensure thread-safe updates
when multiple threads increment the counter. Also made probeCount
volatile to ensure visibility across threads.

Author: Developer

src/main/java/de/rub/nds/scanner/core/execution/ThreadedScanJobExecutor.java

@@ -24,6 +24,7 @@
 import java.util.concurrent.Future;
 import java.util.concurrent.Semaphore;
 import java.util.concurrent.ThreadPoolExecutor;
+import java.util.concurrent.atomic.AtomicInteger;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
@@ -59,8 +60,8 @@ public class ThreadedScanJobExecutor<
     // Used for waiting for Threads in the ThreadPoolExecutor
     private final Semaphore semaphore = new Semaphore(0);
 
-    private int probeCount;
-    private int finishedProbes = 0;
+    private volatile int probeCount;
+    private final AtomicInteger finishedProbes = new AtomicInteger(0);
 
     /**
      * Creates a new ThreadedScanJobExecutor with a custom thread pool.
@@ -139,13 +140,13 @@ private void executeProbesTillNoneCanBeExecuted(ReportT report) throws Interrupt
             List<Future<ScannerProbe<ReportT, StateT>>> finishedFutures = new ArrayList<>();
             for (Future<ScannerProbe<ReportT, StateT>> result : new ArrayList<>(futureResults)) {
                 if (result.isDone()) {
-                    finishedProbes++;
+                    int currentFinishedProbes = finishedProbes.incrementAndGet();
                     ScannerProbe<ReportT, StateT> probeResult = null;
                     try {
                         probeResult = result.get();
                         LOGGER.info(
                                 "[{}/{}] {} probe executed",
-                                finishedProbes,
+                                currentFinishedProbes,
                                 probeCount,
                                 probeResult.getType().getName());
                     } catch (ExecutionException e) {