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

@@ -109,7 +109,7 @@
     "klaro": "^0.7.18",
     "lodash": "^4.17.21",
     "lru-cache": "^7.14.1",
-    "markdown-it": "^13.0.1",
+    "markdown-it": "^13.0.2",
     "markdown-it-mathjax3": "^4.3.2",
     "mirador": "^3.3.0",
     "mirador-dl-plugin": "^0.13.0",

yarn.lock

@@ -7825,10 +7825,10 @@ markdown-it-mathjax3@^4.3.2:
     juice "^8.0.0"
     mathjax-full "^3.2.0"
 
-markdown-it@^13.0.1:
-  version "13.0.1"
-  resolved "https://registry.npmjs.org/markdown-it/-/markdown-it-13.0.1.tgz"
-  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"