Encode username/passwrod pair instead of decoding it while creating request.

(cherry picked from commit 0cda72e6b2)

rule-engine/rule-engine-components/src/main/java/org/thingsboard/rule/engine/rest/TbHttpClient.java

@@ -343,7 +343,7 @@ public class TbHttpClient {
         if (CredentialsType.BASIC == credentials.getType()) {
             BasicCredentials basicCredentials = (BasicCredentials) credentials;
             String authString = basicCredentials.getUsername() + ":" + basicCredentials.getPassword();
-            String encodedAuthString = new String(Base64.getDecoder().decode(authString.getBytes(StandardCharsets.UTF_8)));
+            String encodedAuthString = new String(Base64.getEncoder().encode(authString.getBytes(StandardCharsets.UTF_8)));
             headers.add("Authorization", "Basic " + encodedAuthString);
         }
     }