add missing guzzle-exception annotations (#1055)

This PR enhances exception documentation by adding missing
throws-annotations for guzzle exceptions like ConnectException, which
can be thrown across the package. It builds upon the changes made in
#1050.

**Changes**
Added throws-annotations for guzzle exceptions in method doc blocks.

Author: asteragos

src/Provider/AbstractProvider.php

@@ -17,6 +17,7 @@
 use GuzzleHttp\Client as HttpClient;
 use GuzzleHttp\ClientInterface as HttpClientInterface;
 use GuzzleHttp\Exception\BadResponseException;
+use GuzzleHttp\Exception\GuzzleException;
 use InvalidArgumentException;
 use League\OAuth2\Client\Grant\AbstractGrant;
 use League\OAuth2\Client\Grant\GrantFactory;
@@ -619,6 +620,7 @@ protected function getAccessTokenRequest(array $params)
      * @return AccessTokenInterface
      * @throws IdentityProviderException
      * @throws UnexpectedValueException
+     * @throws GuzzleException
      */
     public function getAccessToken($grant, array $options = [])
     {
@@ -713,6 +715,7 @@ protected function createRequest($method, $url, $token, array $options)
      *
      * @param  RequestInterface $request
      * @return ResponseInterface
+     * @throws GuzzleException
      */
     public function getResponse(RequestInterface $request)
     {
@@ -726,6 +729,7 @@ public function getResponse(RequestInterface $request)
      * @return mixed
      * @throws IdentityProviderException
      * @throws UnexpectedValueException
+     * @throws GuzzleException
      */
     public function getParsedResponse(RequestInterface $request)
     {
@@ -875,6 +879,7 @@ abstract protected function createResourceOwner(array $response, AccessToken $to
      * @return ResourceOwnerInterface
      * @throws IdentityProviderException
      * @throws UnexpectedValueException
+     * @throws GuzzleException
      */
     public function getResourceOwner(AccessToken $token)
     {
@@ -890,6 +895,7 @@ public function getResourceOwner(AccessToken $token)
      * @return mixed
      * @throws IdentityProviderException
      * @throws UnexpectedValueException
+     * @throws GuzzleException
      */
     protected function fetchResourceOwnerDetails(AccessToken $token)
     {