Update dependency hexo-generator-searchdb to v1.5.0

Author: renovate[bot]

package.json

@@ -25,7 +25,7 @@
     "disqusjs": "3.0.2",
     "firebase": "11.1.0",
     "gitalk": "1.8.0",
-    "hexo-generator-searchdb": "1.4.1",
+    "hexo-generator-searchdb": "1.5.0",
     "katex": "0.16.9",
     "lozad": "1.16.0",
     "mathjax": "3.2.2",