fix: Fix anonymous claim type to boolean (CLUBMID-2268)

Author: nitneuk

src/main/java/com/cloudiam/keycloak/anonymous/AnonymousGrantType.java

@@ -98,7 +98,7 @@ public AccessTokenResponse build(AccessTokenResponseBuilder tokenResponseBuilder
 
         if (accessToken != null) {
             event.detail(Details.TOKEN_ID, accessToken.getId());
-            accessToken.setOtherClaims(ANONYMOUS, "true");
+            accessToken.setOtherClaims(ANONYMOUS, true);
 
             String encodedToken = session.tokens().encode(accessToken);
             res.setToken(encodedToken);

src/test/java/com/cloudiam/keycloak/anonymous/AnonymousGrantTypeTests.java

@@ -84,7 +84,7 @@ void should_create_anonymous_authentication() throws VerificationException {
         AccessToken token = verifier.parse().getToken();
         Object anonymousClaim = token.getOtherClaims().get(ANONYMOUS);
 
-        assertThat(anonymousClaim).isNotNull().isEqualTo("true");
+        assertThat(anonymousClaim).isNotNull().isEqualTo(true);
     }
 
     @Test