Bump lodash from 4.17.10 to 4.17.21 in /web-material

Bumps [lodash](https://github.com/lodash/lodash) from 4.17.10 to 4.17.21.
- [Release notes](https://github.com/lodash/lodash/releases)
- [Commits](lodash/lodash@4.17.10...4.17.21)

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

web-material/yarn.lock

@@ -98,8 +98,8 @@ jquery@^3.0.0:
   resolved "https://registry.yarnpkg.com/jquery/-/jquery-3.3.1.tgz#958ce29e81c9790f31be7792df5d4d95fc57fbca"
 
 lodash@^4.17.10:
-  version "4.17.10"
-  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.10.tgz#1b7793cf7259ea38fb3661d4d38b3260af8ae4e7"
+  version "4.17.21"
+  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.21.tgz#679591c564c3bffaae8454cf0b3df370c3d6911c"
 
 require-css@^0.1.10:
   version "0.1.10"