Fixed linter errors

Author: Th-Shivam

src/main/java/com/thealgorithms/searches/SentinelLinearSearch.java

@@ -96,4 +96,4 @@ private <T extends Comparable<T>> int findNull(T[] array) {
         }
         return -1;
     }
-}
+}

src/test/java/com/thealgorithms/searches/SentinelLinearSearchTest.java

@@ -222,4 +222,4 @@ void testSentinelLinearSearchKeyEqualsLastElement() {
         Integer key = 3; // Key equals last element
         assertEquals(2, sentinelLinearSearch.find(array, key), "Should find the first occurrence at index 2, not the last.");
     }
-}
+}