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

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-SANITIZEHTML-6256334

package.json

@@ -61,7 +61,7 @@
     "gatsby-remark-prismjs-title": "1.0.0",
     "gatsby-remark-table-of-contents": "2.0.0",
     "gatsby-source-filesystem": "4.23.0",
-    "gatsby-transformer-remark": "5.25.1",
+    "gatsby-transformer-remark": "6.0.0",
     "gitalk": "1.8.0",
     "html-minifier": "4.0.0",
     "intersection-observer": "0.12.2",

yarn.lock

@@ -14198,13 +14198,13 @@ gatsby-telemetry@^3.25.0:
     lodash "^4.17.21"
     node-fetch "^2.6.7"
 
-gatsby-transformer-remark@5.25.1:
-  version "5.25.1"
-  resolved "https://registry.yarnpkg.com/gatsby-transformer-remark/-/gatsby-transformer-remark-5.25.1.tgz#6df0117dbe3bb39c06e05c85db494948a565b7c8"
-  integrity sha512-6k3uOnZYsJSgmZIWq9Y+Cqb6pysusCUBYpQY1+V9ofpSRbrZGGfuoCeFKd27x/c0jI5jneuL3NXnxwn/JJK1Ig==
+gatsby-transformer-remark@6.0.0:
+  version "6.0.0"
+  resolved "https://registry.yarnpkg.com/gatsby-transformer-remark/-/gatsby-transformer-remark-6.0.0.tgz#28e5103a1aab326ca98224c7fe7b4b866a358d40"
+  integrity sha512-HEOrDNV2Yr5CZbAjDcOVh5ACH/Ov21lgDpGPGxg680TvHAFcwcoPgCy+Ve3iKAQmfRkOY7DKZu0z7JyCCvsNBQ==
   dependencies:
     "@babel/runtime" "^7.15.4"
-    gatsby-core-utils "^3.25.0"
+    gatsby-core-utils "^4.0.0"
     gray-matter "^4.0.3"
     hast-util-raw "^6.0.2"
     hast-util-to-html "^7.1.3"
@@ -14219,7 +14219,7 @@ gatsby-transformer-remark@5.25.1:
     remark-retext "^4.0.0"
     remark-stringify "^9.0.1"
     retext-english "^3.0.4"
-    sanitize-html "^1.27.5"
+    sanitize-html "^2.7.2"
     underscore.string "^3.3.6"
     unified "^9.2.2"
     unist-util-remove-position "^3.0.0"
@@ -23541,7 +23541,7 @@ sanitize-filename@^1.6.3:
   dependencies:
     truncate-utf8-bytes "^1.0.0"
 
-sanitize-html@2.10.0, sanitize-html@^1.27.5:
+sanitize-html@2.10.0, sanitize-html@^2.7.2:
   version "2.10.0"
   resolved "https://registry.yarnpkg.com/sanitize-html/-/sanitize-html-2.10.0.tgz#74d28848dfcf72c39693139131895c78900ab452"
   integrity sha512-JqdovUd81dG4k87vZt6uA6YhDfWkUGruUu/aPmXLxXi45gZExnt9Bnw/qeQU8oGf82vPyaE0vO4aH0PbobB9JQ==