Bump libxmljs in /javascript/ql/test/query-tests/Security/Summaries

Bumps [libxmljs](https://github.com/libxmljs/libxmljs) from 0.19.1 to 1.0.11.
- [Release notes](https://github.com/libxmljs/libxmljs/releases)
- [Commits](https://github.com/libxmljs/libxmljs/commits/v1.0.11)

---
updated-dependencies:
- dependency-name: libxmljs
  dependency-version: 1.0.11
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

javascript/ql/test/query-tests/Security/Summaries/package.json

@@ -4,7 +4,7 @@
   "dependencies": {
     "mysql": "2.15.0",
     "xpath": "0.0.27",
-    "libxmljs": "0.19.1"
+    "libxmljs": "1.0.11"
   },
   "main": "index.js"
 }