bump rc to 5.21

Author: yuvalr1neo

gradle/dependencies.gradle

@@ -28,6 +28,7 @@ ext {
         '5.18': '2.13.11',
         '5.19': '2.13.11',
         '5.20': '2.13.11',
+        '5.21': '2.13.11',
     ]
 
     log4js = [
@@ -42,6 +43,7 @@ ext {
         '5.18': '2.20.0',
         '5.19': '2.20.0',
         '5.20': '2.20.0',
+        '5.21': '2.20.0',
     ]
 
     shiros = [
@@ -56,6 +58,7 @@ ext {
         '5.18': '1.13.0',
         '5.19': '2.0.0',
         '5.20': '2.0.0',
+        '5.21': '2.0.0',
     ]
 
     ver = [