Bumps [base64](https://github.com/marshallpierce/rust-base64) from 0.11.0 to 0.12.0. - [Release notes](https://github.com/marshallpierce/rust-base64/releases) - [Changelog](https://github.com/marshallpierce/rust-base64/blob/master/RELEASE-NOTES.md) - [Commits](https://github.com/marshallpierce/rust-base64/compare/v0.11.0...v0.12.0) Signed-off-by: dependabot-preview[bot] <support@dependabot.com> Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>