Update SENTINEL_VERSION constant to 1.6.1

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

sentinel-core/src/main/java/com/alibaba/csp/sentinel/Constants.java

@@ -30,7 +30,7 @@ import com.alibaba.csp.sentinel.util.VersionUtil;
  */
 public final class Constants {
 
-    public static final String SENTINEL_VERSION = VersionUtil.getVersion("1.6.0");
+    public static final String SENTINEL_VERSION = VersionUtil.getVersion("1.6.1");
 
     public final static int MAX_CONTEXT_NAME_SIZE = 2000;
     public final static int MAX_SLOT_CHAIN_SIZE = 6000;