Bump semver from 6.3.0 to 7.1.1 in /terminus-plugin-manager

Bumps [semver](https://github.com/npm/node-semver) from 6.3.0 to 7.1.1.
- [Release notes](https://github.com/npm/node-semver/releases)
- [Changelog](https://github.com/npm/node-semver/blob/master/CHANGELOG.md)
- [Commits](https://github.com/npm/node-semver/compare/v6.3.0...v7.1.1)

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

terminus-plugin-manager/package.json

@@ -20,7 +20,7 @@
     "@types/semver": "^6.0.0",
     "axios": "^0.19.0",
     "mz": "^2.6.0",
-    "semver": "^6.1.0"
+    "semver": "^7.1.1"
   },
   "peerDependencies": {
     "@angular/common": "^7",