Bump semver from 6.3.0 to 6.3.1 in /admin

Bumps [semver](https://github.com/npm/node-semver) from 6.3.0 to 6.3.1.
- [Release notes](https://github.com/npm/node-semver/releases)
- [Changelog](https://github.com/npm/node-semver/blob/v6.3.1/CHANGELOG.md)
- [Commits](https://github.com/npm/node-semver/compare/v6.3.0...v6.3.1)

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

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

admin/yarn.lock

@@ -794,9 +794,9 @@ scheduler@^0.23.0:
     loose-envify "^1.1.0"
 
 semver@^6.3.0:
-  version "6.3.0"
-  resolved "https://registry.npmjs.org/semver/-/semver-6.3.0.tgz"
-  integrity sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw==
+  version "6.3.1"
+  resolved "https://registry.yarnpkg.com/semver/-/semver-6.3.1.tgz#556d2ef8689146e46dcea4bfdd095f3434dffcb4"
+  integrity sha512-BR7VvDCVHO+q2xBEWskxS6DJE1qRnb7DxzUrogb71CWoSficBxYsiAGd+Kl0mmq/MprG9yArRkyrQxTO6XjMzA==
 
 "source-map-js@>=0.6.2 <2.0.0", source-map-js@^1.0.2:
   version "1.0.2"