i wanted to install some wine dependencies but when ever i type sudo apt update this brave browser stopping me from completing it

Question

W: GPG error: https://brave-browser-apt-release.s3.brave.com stable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 0686B78420038257 E: The repository 'https://brave-browser-apt-release.s3.brave.com stable InRelease' is not signed. N: Updating from such a repository can't be done securely, and is therefore disabled by default. N: See apt-secure(8) manpage for repository creation and user configuration details. user@shadow:~/Desktop$