update rflib@2.2.19

Author: bourgeoa

package-lock.json

@@ -98,7 +98,7 @@
     "nodemailer": "^6.7.2",
     "oidc-op-express": "^0.0.3",
     "owasp-password-strength-test": "^1.3.0",
-    "rdflib": "^2.2.17",
+    "rdflib": "^2.2.19",
     "recursive-readdir": "^2.2.2",
     "request": "^2.88.2",
     "rimraf": "^3.0.2",