Bump lodash, grunt, grunt-pot and grunt-wp-deploy

Bumps [lodash](https://github.com/lodash/lodash), [grunt](https://github.com/gruntjs/grunt), [grunt-pot](https://github.com/stephenharris/grunt-pot) and [grunt-wp-deploy](https://github.com/stephenharris/grunt-wp-deploy). These dependencies needed to be updated together.

Updates `lodash` from 4.17.20 to 4.17.21
- [Release notes](https://github.com/lodash/lodash/releases)
- [Commits](lodash/lodash@4.17.20...4.17.21)

Updates `grunt` from 0.4.5 to 1.5.3
- [Release notes](https://github.com/gruntjs/grunt/releases)
- [Changelog](https://github.com/gruntjs/grunt/blob/main/CHANGELOG)
- [Commits](gruntjs/grunt@v0.4.5...v1.5.3)

Updates `grunt-pot` from 0.2.1 to 0.3.0
- [Release notes](https://github.com/stephenharris/grunt-pot/releases)
- [Commits](stephenharris/grunt-pot@0.2.1...0.3.0)

Updates `grunt-wp-deploy` from 1.1.0 to 2.1.2
- [Release notes](https://github.com/stephenharris/grunt-wp-deploy/releases)
- [Commits](https://github.com/stephenharris/grunt-wp-deploy/commits/v2.1.2)

---
updated-dependencies:
- dependency-name: lodash
  dependency-type: indirect
- dependency-name: grunt
  dependency-type: direct:development
- dependency-name: grunt-pot
  dependency-type: direct:development
- dependency-name: grunt-wp-deploy
  dependency-type: direct:development
...

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

Author: dependabot[bot]