Bump serialize-javascript from 1.9.1 to 2.1.2

Bumps [serialize-javascript](https://github.com/yahoo/serialize-javascript) from 1.9.1 to 2.1.2. - [Release notes](https://github.com/yahoo/serialize-javascript/releases) - [Commits](yahoo/serialize-javascript@v1.9.1...v2.1.2) Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]