SessionTokenAuthenticationDetailsProvider httpClient resource leak

[mbalamaruthu]

We're using SessionTokenAuthenticationDetailsProvider for our local development and testing, Noticed that httpClient is not closed during refreshSessionToken.

The snippet causing the leak is as below. Kindly enclose within try or close the http client. Thanks.

`public synchronized boolean refreshSessionToken() {
com.oracle.bmc.Service service =
Services.serviceBuilder().serviceName("auth").serviceEndpointPrefix("auth").build();
String endpoint = Region.formatDefaultRegionEndpoint(service, region);
LOG.debug(
"Refreshing session token, refresh endpoint: {}/v1/authentication/refresh",
endpoint);

    try {
        HttpClient httpClient =
                HttpProvider.getDefault()
                        .newBuilder()
                        .baseUri(endpoint)
                        .registerRequestInterceptor(
                                Priorities.AUTHENTICATION,
                                new AuthnClientFilter(
                                        DefaultRequestSigner.createRequestSigner(this),
                                        Collections.emptyMap()))
                        .build();

        SessionTokenRefreshRequest request =
                new SessionTokenRefreshRequest((this.sessionToken));`