celestia-app v0.14.0-rc1

What's Changed

• chore: bump NMT to v0.15.0 by @rootulp in https://github.com/celestiaorg/celestia-app/pull/1581

Full Changelog: https://github.com/celestiaorg/celestia-app/compare/v0.14.0-rc0...v0.14.0-rc1