Bump snowpack from 2.11.1 to 2.18.5

Bumps [snowpack](https://github.com/snowpackjs/snowpack) from 2.11.1 to 2.18.5.
- [Release notes](https://github.com/snowpackjs/snowpack/releases)
- [Changelog](https://github.com/snowpackjs/snowpack/blob/main/CHANGELOG.md)
- [Commits](https://github.com/snowpackjs/snowpack/commits)

---
updated-dependencies:
- dependency-name: snowpack
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Gruntfile.js

@@ -9,7 +9,7 @@ module.exports = function (grunt) {
       main: {
         cwd: "./node_modules/@patternfly/patternfly/assets/",
         src: ["**/*", '!**/fontawesome/**'],
-        dest: "public/web_modules/@patternfly/patternfly/assets/",
+        dest: "public/assets/",
         expand: true,
       },
       sso: {

package.json

@@ -84,7 +84,7 @@
     "postcss-cli": "^8.3.1",
     "postcss-import": "^14.0.2",
     "prettier": "^2.3.2",
-    "snowpack": "2.11.1",
+    "snowpack": "2.18.5",
     "ts-node": "^10.0.0",
     "typescript": "4.2.4"
   }