build(deps): bump gatsby-plugin-sitemap from 5.3.0 to 5.4.0 in /docs (golangci#2447)

Author: dependabot[bot]

docs/package-lock.json

@@ -25,7 +25,7 @@
     "gatsby-plugin-react-svg": "^3.1.0",
     "gatsby-plugin-robots-txt": "^1.6.14",
     "gatsby-plugin-sharp": "^3.10.2",
-    "gatsby-plugin-sitemap": "^5.3.0",
+    "gatsby-plugin-sitemap": "^5.4.0",
     "gatsby-remark-autolink-headers": "^2.11.0",
     "gatsby-remark-copy-linked-files": "^5.4.0",
     "gatsby-remark-embedder": "^4.2.0",