Bump Webcast Feeds module to 3.0.2

This resolves

TypeError: Drupal\cern_webcast_feeds\Feeds\Fetcher\WebcastFetcher::get(): 
Return value must be of type Guzzle\Http\Message\Response, GuzzleHttp\Psr
7\Response returned in Drupal\cern_webcast_feeds\Feeds\Fetcher\WebcastFet
cher->get() (line 184 of /app/web/modules/custom/cern-webcast-feeds/src/F
eeds/Fetcher/WebcastFetcher.php) 

affecting some websites.

approved this merge request

merged

mentioned in commit 3de49c6a