Bump lru-cache from 5.0.0 to 5.1.1 (#5213)

Bumps [lru-cache](https://github.com/isaacs/node-lru-cache) from 5.0.0 to 5.1.1.
- [Release notes](https://github.com/isaacs/node-lru-cache/releases)
- [Commits](https://github.com/isaacs/node-lru-cache/compare/v5.0.0...v5.1.1)

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

package.json

@@ -31,7 +31,7 @@
     "follow-redirects": "1.5.9",
     "intersect": "1.0.1",
     "lodash": "4.17.11",
-    "lru-cache": "5.0.0",
+    "lru-cache": "5.1.1",
     "mime": "2.4.0",
     "mongodb": "3.1.10",
     "parse": "2.1.0",