Update project tether to v0.6.5

libgrabber updated project tether to v0.6.5.

@HubSpot

### Metadata information

```json
{
  "metadata": {
    "packageManager": "github",
    "name": "tether",
    "repo": "HubSpot/tether",
    "files": {
      "include": ["tether.min.js"],
      "exclude": []
    },
    "path": "/home/jsdelivr/files/tether",
    "localVersions": [],
    "remoteVersions": ["v0.2.5", "v0.2.6", "v0.2.7", "v0.2.8", "v0.2.9", "v0.3.0", "v0.3.1", "v0.3.2", "v0.3.3", "v0.3.4", "v0.3.5", "v0.3.6", "v0.4.0", "v0.4.1", "v0.4.2", "v0.4.3", "v0.4.4", "v0.4.5", "v0.4.6", "v0.4.7", "v0.4.8", "v0.5.0", "v0.5.1", "v0.5.2", "v0.6.0", "v0.6.1", "v0.6.2", "v0.6.3", "v0.6.4", "v0.6.5"],
    "branchVersions": []
  },
  "version": "v0.6.5",
  "updated": true,
  "updatePath": "/home/jsdelivr/files/tether/0.6.5",
  "branch": "tether/v0.6.5"
}
```