WASHINGTON, July 6 (Reuters) - The U.S. Senate Commerce Committee plans to vote next week on President Joe Biden's nominee for a key fifth seat on the U.S. Federal Communications Commission (FCC). Democrats have been stymied since 2021 from gaining a majority on the five-member telecommunications regulator. Anna Gomez, a Democratic telecommunications attorney, currently serves as a senior adviser for the State Department's Bureau of Cyberspace and Digital Policy, leading U.S. preparations for the 2023 World Radio Conference. The committee plans to vote July 12 on Gomez as well nominations for new terms for two current commissioners Brendan Carr and...