Bump lodash.template from 4.4.0 to 4.5.0 in /email_mailbox

Bumps [lodash.template](https://github.com/lodash/lodash) from 4.4.0 to 4.5.0.
- [Release notes](https://github.com/lodash/lodash/releases)
- [Commits](lodash/lodash@4.4.0...4.5.0)

Signed-off-by: dependabot[bot] <support@github.com>