build(deps): bump whatwg-fetch from 3.6.2 to 3.6.18 in /html

Bumps [whatwg-fetch](https://github.com/github/fetch) from 3.6.2 to 3.6.18.
- [Release notes](https://github.com/github/fetch/releases)
- [Changelog](https://github.com/JakeChampion/fetch/blob/master/CHANGELOG.md)
- [Commits](JakeChampion/fetch@v3.6.2...v3.6.18)

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

Signed-off-by: dependabot[bot] <support@github.com>

html/package.json

@@ -53,7 +53,7 @@
     "file-saver": "^2.0.5",
     "preact": "^10.15.1",
     "trzsz": "^1.1.0",
-    "whatwg-fetch": "^3.6.2",
+    "whatwg-fetch": "^3.6.18",
     "xterm": "^5.2.1",
     "xterm-addon-canvas": "^0.4.0",
     "xterm-addon-fit": "^0.7.0",

html/yarn.lock

@@ -9579,7 +9579,7 @@ __metadata:
     webpack-cli: ^5.1.4
     webpack-dev-server: ^4.15.1
     webpack-merge: ^5.9.0
-    whatwg-fetch: ^3.6.2
+    whatwg-fetch: ^3.6.18
     xterm: ^5.2.1
     xterm-addon-canvas: ^0.4.0
     xterm-addon-fit: ^0.7.0
@@ -10181,10 +10181,10 @@ __metadata:
   languageName: node
   linkType: hard
 
-"whatwg-fetch@npm:^3.6.2":
-  version: 3.6.2
-  resolution: "whatwg-fetch@npm:3.6.2"
-  checksum: ee976b7249e7791edb0d0a62cd806b29006ad7ec3a3d89145921ad8c00a3a67e4be8f3fb3ec6bc7b58498724fd568d11aeeeea1f7827e7e1e5eae6c8a275afed
+"whatwg-fetch@npm:^3.6.18":
+  version: 3.6.18
+  resolution: "whatwg-fetch@npm:3.6.18"
+  checksum: 72fd318a00fd9031f7f5b28bfe30e458ca5e6ebc9b3de6e03edf810f455bca0ec954035bd9f1b5f9e6a82bbdc3fbba59b14bee24c039460c8a75f8f990ebe0b1
   languageName: node
   linkType: hard