@Override
    void doAddBodyParams0(QueryParamsBuilder formBuilder) {
        formBuilder.add(REFRESH_TOKEN, refreshToken);
    }
A request to refresh an access token using a refresh token as per
<a href="https://datatracker.ietf.org/doc/html/rfc6749#section-6">RFC 6749, Section 6</a>.
oauth2/src/main/java/com/linecorp/armeria/client/auth/oauth2/RefreshAccessTokenRequest.java