dependency: bump com.puppycrawl.tools:checkstyle from 13.6.0 to 13.8.0

pom.xml

@@ -33,7 +33,7 @@
 
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    <checkstyle.version>13.6.0</checkstyle.version>
+    <checkstyle.version>13.8.0</checkstyle.version>
     <maven.checkstyle.plugin.version>3.6.0</maven.checkstyle.plugin.version>
     <maven.compiler.source>21</maven.compiler.source>
     <maven.compiler.target>21</maven.compiler.target>

src/test/java/com/puppycrawl/tools/checkstyle/jgit/GitDiffOnOpenSourceTest.java

@@ -91,6 +91,11 @@ private void shouldRejectLine(SuppressionPatchFilter filter, int lineNo, String
                 "Audit event should be rejected when there are no matching patch filters");
     }
 
+    private static SuppressionPatchFilter
+        createSuppressionPatchFilter(String fileName) throws Exception {
+        return createSuppressionPatchFilter(fileName, "patchedline");
+    }
+
     private static SuppressionPatchFilter
         createSuppressionPatchFilter(String fileName, String strategy) throws Exception {
         final SuppressionPatchFilter suppressionPatchFilter = new SuppressionPatchFilter();
@@ -99,9 +104,4 @@ private void shouldRejectLine(SuppressionPatchFilter filter, int lineNo, String
         suppressionPatchFilter.finishLocalSetup();
         return suppressionPatchFilter;
     }
-
-    private static SuppressionPatchFilter
-        createSuppressionPatchFilter(String fileName) throws Exception {
-        return createSuppressionPatchFilter(fileName, "patchedline");
-    }
 }