Update project leaflet to v0.7.3

libgrabber updated project leaflet to v0.7.3.

@Leaflet

### Metadata information

```json
{
  "metadata": {
    "packageManager": "github",
    "name": "leaflet",
    "repo": "Leaflet/Leaflet",
    "files": {
      "basePath": "dist/",
      "include": ["**/*"],
      "exclude": []
    },
    "path": "/home/jsdelivr/files/leaflet",
    "localVersions": ["0.5.1", "0.6.2", "0.6.4", "0.7.2"],
    "remoteVersions": ["v0.2.1", "v0.3.1", "v0.4.1", "v0.4.2", "v0.4.3", "v0.4.4", "v0.4.5", "v0.5.1", "v0.6.1", "v0.6.2", "v0.6.3", "v0.6.4", "v0.7.1", "v0.7.2", "v0.7.3"],
    "branchVersions": []
  },
  "version": "v0.7.3",
  "updated": true,
  "updatePath": "/home/jsdelivr/files/leaflet/0.7.3",
  "branch": "leaflet/v0.7.3"
}
```