Bump whatwg-fetch from 3.6.2 to 3.6.20 (#6089)

Bumps [whatwg-fetch](https://github.com/github/fetch) from 3.6.2 to 3.6.20.
- [Release notes](https://github.com/github/fetch/releases)
- [Changelog](https://github.com/JakeChampion/fetch/blob/main/CHANGELOG.md)
- [Commits](https://github.com/github/fetch/compare/v3.6.2...v3.6.20)

---
updated-dependencies:
- dependency-name: whatwg-fetch
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Daniel Starns <danielstarns@hotmail.com>

package.json

@@ -64,7 +64,7 @@
     "sass": "1.42.1",
     "typescript": "5.5.4",
     "vuepress": "1.9.10",
-    "whatwg-fetch": "3.6.2"
+    "whatwg-fetch": "3.6.20"
   },
   "resolutions": {
     "backbone-undo/backbone": "1.3.3",

yarn.lock

@@ -14401,10 +14401,10 @@ whatwg-encoding@^3.1.1:
   dependencies:
     iconv-lite "0.6.3"
 
-whatwg-fetch@3.6.2:
-  version "3.6.2"
-  resolved "https://registry.npmjs.org/whatwg-fetch/-/whatwg-fetch-3.6.2.tgz#dced24f37f2624ed0281725d51d0e2e3fe677f8c"
-  integrity sha512-bJlen0FcuU/0EMLrdbJ7zOnW6ITZLrZMIarMUVmdKtsGvZna8vxKYaexICWPfZ8qwf9fzNq+UEIZrnSaApt6RA==
+whatwg-fetch@3.6.20:
+  version "3.6.20"
+  resolved "https://registry.npmjs.org/whatwg-fetch/-/whatwg-fetch-3.6.20.tgz#580ce6d791facec91d37c72890995a0b48d31c70"
+  integrity sha512-EqhiFU6daOA8kpjOWTL0olhVOF3i7OrFzSYiGsEMB8GcXS+RrzauAERX65xMeNWVqxA6HXH2m69Z9LaKKdisfg==
 
 whatwg-mimetype@^3.0.0:
   version "3.0.0"