Bump lodash from 3.10.1 to 4.17.21 in /legacy

Bumps [lodash](https://github.com/lodash/lodash) from 3.10.1 to 4.17.21.
- [Release notes](https://github.com/lodash/lodash/releases)
- [Commits](lodash/lodash@3.10.1...4.17.21)

---
updated-dependencies:
- dependency-name: lodash
  dependency-type: indirect
...

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

legacy/yarn.lock

@@ -3861,7 +3861,7 @@ lodash@4.17.21, lodash@^4.0.1, lodash@^4.17.11, lodash@^4.17.14, lodash@^4.17.15
 lodash@^3.8.0:
   version "3.10.1"
   resolved "https://registry.yarnpkg.com/lodash/-/lodash-3.10.1.tgz#5bf45e8e49ba4189e17d482789dfd15bd140b7b6"
-  integrity sha1-W/Rejkm6QYnhfUgnid/RW9FAt7Y=
+  integrity sha512-9mDDwqVIma6OZX79ZlDACZl8sBm0TEnkf99zV3iMA4GzkIT/9hiqP5mY0HoT1iNLCrKc/R1HByV+yJfRWVJryQ==
 
 log-symbols@^2.1.0:
   version "2.2.0"