Update Comunica monorepo packages to ^2.6.8

Author: renovate[bot]

package.json

@@ -60,8 +60,8 @@
     "@babel/core": "^7.16.0",
     "@babel/preset-env": "^7.16.4",
     "@comunica/config-query-sparql": "^2.6.0",
-    "@comunica/query-sparql": "^2.6.7",
-    "@comunica/runner": "^2.6.7",
+    "@comunica/query-sparql": "^2.6.8",
+    "@comunica/runner": "^2.6.8",
     "@rubensworks/solid-client-authn-browser": "^1.13.0",
     "@turf/centroid": "^6.5.0",
     "babel-loader": "^8.2.3",