feat: remove old token

(cherry picked from commit 137ff5b)

camunda-sdk-java/java-common/src/main/java/io/camunda/common/auth/SelfManagedAuthentication.java

@@ -78,6 +78,7 @@ public Authentication build() {
   @Override
   public void resetToken(Product product) {
     JwtCredential jwtCredential = jwtConfig.getProduct(product);
+    tokens.remove(product);
     retrieveToken(product, jwtCredential);
   }