package.json: bump honkit-tester

Signed-off-by: Huang Rui <vowstar@gmail.com>

Author: vowstar

package.json

@@ -14,7 +14,7 @@
   "description": "PlantUML plugin for GitBook and Honkit",
   "devDependencies": {
     "coveralls": "^3.1.1",
-    "honkit-tester": "^1.9.7",
+    "honkit-tester": "^1.9.8",
     "jshint": "^2.13.6",
     "mocha": "^10.2.0",
     "nyc": "^15.1.0"