Revert "improvements"

This reverts commit 9d8a7f04.

@@ -32,7 +32,7 @@
         <pkg.user>thingsboard</pkg.user>
         <spring-boot.version>2.2.6.RELEASE</spring-boot.version>
         <spring-oauth2.version>2.1.2.RELEASE</spring-oauth2.version>
-        <spring.version>5.2.3.RELEASE</spring.version>
+        <spring.version>5.2.6.RELEASE</spring.version>
         <spring-security.version>5.2.3.RELEASE</spring-security.version>
         <spring-data-redis.version>2.2.4.RELEASE</spring-data-redis.version>
         <jedis.version>3.1.0</jedis.version>
@@ -467,12 +467,12 @@
             <dependency>
                 <groupId>org.springframework.security</groupId>
                 <artifactId>spring-security-oauth2-client</artifactId>
-                <version>${spring-security.version}</version>
+                <version>${spring.version}</version>
             </dependency>
             <dependency>
                 <groupId>org.springframework.security</groupId>
                 <artifactId>spring-security-oauth2-jose</artifactId>
-                <version>${spring-security.version}</version>
+                <version>${spring.version}</version>
             </dependency>
             <dependency>
                 <groupId>org.springframework.boot</groupId>