refactor: Move @Nullable method annotations to the return type

Use this link to re-run the recipe: https://app.moderne.io/recipes/org.openrewrite.staticanalysis.NullableOnMethodReturnType?organizationId=T3BlblJld3JpdGU%3D

Co-authored-by: Moderne <team@moderne.io>

src/main/java/org/openrewrite/java/security/PartialPathTraversalVulnerability.java

@@ -188,8 +188,7 @@ static class ExpressionWithTry {
             @Nullable J.Try maybeTryStatement;
         }
 
-        @Nullable
-        private static J.Try findNearestRelevantTry(Cursor startCursor) {
+        private static @Nullable J.Try findNearestRelevantTry(Cursor startCursor) {
             for (Cursor cursor : (Iterable<Cursor>) startCursor::getPathAsCursors) {
                 Object cursorValue = cursor.getValue();
                 if (cursorValue instanceof J.Try) {

src/main/java/org/openrewrite/java/security/UseFilesCreateTempDirectory.java

@@ -345,8 +345,7 @@ private static boolean isMethodForIdent(J.Identifier ident, InvocationMatcher in
             return false;
         }
 
-        @Nullable
-        private static J.Identifier getIdent(J createFileStatement) {
+        private static @Nullable J.Identifier getIdent(J createFileStatement) {
             if (createFileStatement instanceof J.Assignment) {
                 J.Assignment assignment = (J.Assignment) createFileStatement;
                 return (J.Identifier) assignment.getVariable();

src/main/java/org/openrewrite/java/security/marshalling/SecureSnakeYamlConstructor.java

@@ -236,8 +236,7 @@ private boolean isSnakeYamlType(@Nullable JavaType type) {
         return isUnsafe.get();
     }
 
-    @Nullable
-    private static Cursor getOuterMostExecutableBlock(Cursor startCursor) {
+    private static @Nullable Cursor getOuterMostExecutableBlock(Cursor startCursor) {
         Cursor blockCursor = null;
         for (Cursor cursor : (Iterable<Cursor>) startCursor::getPathAsCursors) {
             Object cursorValue = cursor.getValue();