Error: Function yaml.safeLoad is removed in js-yaml 4. Use yaml.load instead, which is now safe by default.

hexo server --debug
```bash
Error: Function yaml.safeLoad is removed in js-yaml 4. Use yaml.load instead, which is now safe by default.
at Object.safeLoad (/Users/username/hexo/blog/node_modules/_js-yaml@4.1.0@js-yaml/index.js:10:11)
**at getSettings (/Users/username/hexo/blog/node_modules/_hexo-admin@2.3.0@hexo-admin/api.js:44:26)**
at /Users/username/hexo/blog/node_modules/_hexo-admin@2.3.0@hexo-admin/api.js:150:14
at /Users/username/hexo/blog/node_modules/_hexo-admin@2.3.0@hexo-admin/api.js:141:7
at call (/Users/username/hexo/blog/node_modules/_connect@3.7.0@connect/index.js:239:7)
at next (/Users/username/hexo/blog/node_modules/_connect@3.7.0@connect/index.js:183:5)
at next (/Users/username/hexo/blog/node_modules/_connect@3.7.0@connect/index.js:161:14)
at jsonParser (/Users/username/hexo/blog/node_modules/_body-parser@1.19.0@body-parser/lib/types/json.js:110:7)
at call (/Users/username/hexo/blog/node_modules/_connect@3.7.0@connect/index.js:239:7)
at next (/Users/username/hexo/blog/node_modules/_connect@3.7.0@connect/index.js:183:5)
at SendStream.error (/Users/username/hexo/blog/node_modules/_serve-static@1.14.1@serve-static/index.js:121:7)
at SendStream.emit (events.js:376:20)
at SendStream.error (/Users/username/hexo/blog/node_modules/_send@0.17.1@send/index.js:270:17)
at SendStream.onStatError (/Users/username/hexo/blog/node_modules/_send@0.17.1@send/index.js:421:12)
at next (/Users/username/hexo/blog/node_modules/_send@0.17.1@send/index.js:735:16)
at onstat (/Users/username/hexo/blog/node_modules/_send@0.17.1@send/index.js:724:14)
at FSReqCallback.oncomplete (fs.js:192:21)
```

package.json
```json
"dependencies": {
"hexo": "^5.0.0",
"hexo-admin": "^2.3.0",
...
```

Start with getSettings in api.js around line 44, as shown in the stack trace, and reproduce the problem with hexo server --debug. Verify that the js-yaml compatibility error no longer occurs and the Hexo admin server starts successfully.

Written by the indexing model from the issue text.