Update project webshim to 1.15.5

libgrabber updated project webshim to 1.15.5.

@aFarkas

### Metadata information

```json
{
  "metadata": {
    "packageManager": "github",
    "name": "webshim",
    "repo": "aFarkas/webshim",
    "files": {
      "basePath": "js-webshim/minified",
      "include": ["**/*"],
      "exclude": []
    },
    "path": "/home/jsdelivr/files/webshim",
    "localVersions": ["1.8.10", "1.8.12", "1.9.1", "1.9.4", "1.10.1", "1.10.9", "1.11.0", "1.12.4", "1.13.1-pre", "1.13.1", "1.14.2", "1.14.3", "1.14.4", "1.14.5"],
    "remoteVersions": ["1.6.2RC1", "1.6.2", "1.6.3", "1.6.4", "1.6.6", "1.7.0", "1.7.1", "1.7.2", "1.8.0", "1.8.1", "1.8.2", "1.8.3", "1.8.4", "1.8.5", "1.8.6", "1.8.7", "1.8.8", "1.8.9", "1.8.10RC2", "1.8.10", "1.8.11", "1.8.12", "1.8.13", "1.9.0", "1.9.1", "1.9.2", "1.9.3", "1.9.4", "1.9.5", "1.9.6", "1.9.7", "1.10.0RC1", "1.10.0RC2", "1.10.0", "1.10.1", "1.10.2", "1.10.3RC2", "1.10.3", "1.10.4RC1", "1.10.4RC2", "1.10.4RC3", "1.10.4RC4", "1.10.4", "1.10.5", "1.10.6", "1.10.7RC1", "1.10.7", "1.10.8", "1.10.9", "1.10.10", "1.11.0", "1.11.1", "1.11.2", "1.11.3", "1.11.4-RC1", "1.11.5", "1.11.6jq", "1.11.6", "1.12.0", "1.12.1", "1.12.2", "1.12.3", "1.12.4", "1.12.5-RC-1", "1.12.5", "1.12.6-RC2", "1.12.6", "1.12.7", "1.13.0", "1.13.1", "1.13.2-RC1", "1.13.2-RC2", "1.14.0", "1.14.1", "1.14.2", "1.14.3-RC1", "1.14.3-RC2", "1.14.3-RC3", "1.14.3", "1.14.4-RC1", "1.14.4-RC2", "1.14.4-RC3", "1.14.4-RC4", "1.14.4", "1.14.5-RC1", "1.14.5-RC2", "1.14.5", "1.14.6-RC1", "1.14.6-RC2", "1.14.6", "1.15.0-RC1", "1.15.0-RC2", "1.15.0", "1.15.1-RC1", "1.15.1", "1.15.2", "1.15.3-RC1", "1.15.3", "1.15.4", "1.15.5"],
    "branchVersions": []
  },
  "version": "1.15.5",
  "updated": true,
  "updatePath": "/home/jsdelivr/files/webshim/1.15.5",
  "branch": "webshim/1.15.5"
}
```