fix: package.json & yarn.lock to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-MARKDOWNIT-6483324

package.json

@@ -36,7 +36,7 @@
     "koa-jwt": "^4.0.1",
     "koa-sse-stream": "^0.2.0",
     "lodash": "^4.17.20",
-    "markdown-it": "^13.0.1",
+    "markdown-it": "^13.0.2",
     "markdown-it-emoji": "^2.0.0",
     "markdown-it-github-headings": "^2.0.0",
     "markdown-it-highlightjs": "^4.0.1",

yarn.lock

@@ -7480,10 +7480,10 @@ markdown-it-task-checkbox@^1.0.6:
   resolved "https://registry.yarnpkg.com/markdown-it-task-checkbox/-/markdown-it-task-checkbox-1.0.6.tgz#9ebd7b6382e99162264605bc580f2ac118be4242"
   integrity sha512-7pxkHuvqTOu3iwVGmDPeYjQg+AIS9VQxzyLP9JCg9lBjgPAJXGEkChK6A2iFuj3tS0GV3HG2u5AMNhcQqwxpJw==
 
-markdown-it@^13.0.1:
-  version "13.0.1"
-  resolved "https://registry.npmjs.org/markdown-it/-/markdown-it-13.0.1.tgz#c6ecc431cacf1a5da531423fc6a42807814af430"
-  integrity sha512-lTlxriVoy2criHP0JKRhO2VDG9c2ypWCsT237eDiLqi09rmbKoUetyGHq2uOIRoRS//kfoJckS0eUzzkDR+k2Q==
+markdown-it@^13.0.2:
+  version "13.0.2"
+  resolved "https://registry.yarnpkg.com/markdown-it/-/markdown-it-13.0.2.tgz#1bc22e23379a6952e5d56217fbed881e0c94d536"
+  integrity sha512-FtwnEuuK+2yVU7goGn/MJ0WBZMM9ZPgU9spqlFs7/A/pDIUNSOQZhUgOqYCficIuR2QaFnrt8LHqBWsbTAoI5w==
   dependencies:
     argparse "^2.0.1"
     entities "~3.0.1"