Update project flexboxgrid to v5.0.0

libgrabber updated project flexboxgrid to v5.0.0.

@kristoferjoseph

### Metadata information

```json
{
  "metadata": {
    "packageManager": "github",
    "name": "flexboxgrid",
    "repo": "kristoferjoseph/flexboxgrid",
    "files": {
      "basePath": "css/",
      "include": ["flexboxgrid.min.css"],
      "exclude": []
    },
    "path": "/home/jsdelivr/files/flexboxgrid",
    "localVersions": ["3.0.1"],
    "remoteVersions": ["v0.1.0", "v0.1.1", "v0.2.0", "v1.0.0", "v1.1.0", "v1.1.1", "v2.0.0", "v3.0.0", "v3.0.1", "v4.0.0", "v5.0.0"],
    "branchVersions": []
  },
  "version": "v5.0.0",
  "updated": true,
  "updatePath": "/home/jsdelivr/files/flexboxgrid/5.0.0",
  "branch": "flexboxgrid/v5.0.0"
}
```