fix(deps): update dependency hexo to v7 (#185)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package.json

@@ -14,7 +14,7 @@
   },
   "dependencies": {
     "@waline/hexo-next": "3.0.1",
-    "hexo": "6.3.0",
+    "hexo": "7.3.0",
     "hexo-filter-flowchart": "^1.0.4",
     "hexo-generator-archive": "2.0.0",
     "hexo-generator-category": "2.0.0",