fix(gatsby-plugin-sitemap): Sitemap path bug (gatsbyjs#31184)

Co-authored-by: gatsbybot <[email protected]>

yarn.lock

@@ -1918,21 +1918,16 @@
     "@types/node" "*"
     form-data "^3.0.0"
 
-"@types/node@*":
-  version "15.0.1"
-  resolved "https://registry.yarnpkg.com/@types/node/-/node-15.0.1.tgz#ef34dea0881028d11398be5bf4e856743e3dc35a"
-  integrity sha512-TMkXt0Ck1y0KKsGr9gJtWGjttxlZnnvDtphxUOSd0bfaR6Q1jle+sPvrzNR1urqYTWMinoKvjKfXUGsumaO1PA==
+"@types/node@*", "@types/node@^8.5.7":
+  version "8.10.66"
+  resolved "https://registry.yarnpkg.com/@types/node/-/node-8.10.66.tgz#dd035d409df322acc83dff62a602f12a5783bbb3"
+  integrity sha512-tktOkFUA4kXx2hhhrB8bIFb5TbwzS4uOhKEmwiD+NoiL0qtP2OQ9mFldbgD4dV1djrlBYP6eBuQZiWjuHUpqFw==
 
 "@types/node@^14.14.10":
   version "14.14.44"
   resolved "https://registry.yarnpkg.com/@types/node/-/node-14.14.44.tgz#df7503e6002847b834371c004b372529f3f85215"
   integrity sha512-+gaugz6Oce6ZInfI/tK4Pq5wIIkJMEJUu92RB3Eu93mtj4wjjjz9EB5mLp5s1pSsLXdC/CPut/xF20ZzAQJbTA==
 
-"@types/node@^8.5.7":
-  version "8.10.66"
-  resolved "https://registry.yarnpkg.com/@types/node/-/node-8.10.66.tgz#dd035d409df322acc83dff62a602f12a5783bbb3"
-  integrity sha512-tktOkFUA4kXx2hhhrB8bIFb5TbwzS4uOhKEmwiD+NoiL0qtP2OQ9mFldbgD4dV1djrlBYP6eBuQZiWjuHUpqFw==
-
 "@types/parse-json@^4.0.0":
   version "4.0.0"
   resolved "https://registry.yarnpkg.com/@types/parse-json/-/parse-json-4.0.0.tgz#2f8bb441434d163b35fb8ffdccd7138927ffb8c0"