Bump the npm_and_yarn group across 1 directory with 3 updates

Bumps the npm_and_yarn group with 3 updates in the /website directory: [ejs](https://github.com/mde/ejs), [firebase-tools](https://github.com/firebase/firebase-tools) and [postcss](https://github.com/postcss/postcss).


Updates `ejs` from 3.1.9 to 3.1.10
- [Release notes](https://github.com/mde/ejs/releases)
- [Commits](mde/ejs@v3.1.9...v3.1.10)

Updates `firebase-tools` from 13.1.0 to 13.6.0
- [Release notes](https://github.com/firebase/firebase-tools/releases)
- [Changelog](https://github.com/firebase/firebase-tools/blob/main/CHANGELOG.md)
- [Commits](firebase/firebase-tools@v13.1.0...v13.6.0)

Updates `postcss` from 6.0.23 to 8.5.6
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@6.0.23...8.5.6)

---
updated-dependencies:
- dependency-name: ejs
  dependency-version: 3.1.10
  dependency-type: direct:development
  dependency-group: npm_and_yarn
- dependency-name: firebase-tools
  dependency-version: 13.6.0
  dependency-type: direct:development
  dependency-group: npm_and_yarn
- dependency-name: postcss
  dependency-version: 8.5.6
  dependency-type: direct:development
  dependency-group: npm_and_yarn
...

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

Author: dependabot[bot]

website/package.json

@@ -17,8 +17,8 @@
   },
   "license": "MIT",
   "devDependencies": {
-    "ejs": "3.1.9",
-    "firebase-tools": "13.1.0",
+    "ejs": "3.1.10",
+    "firebase-tools": "13.6.0",
     "jstransformer-ejs": "0.2.0",
     "metalsmith": "2.5.1",
     "metalsmith-in-place": "4.2.0",
@@ -31,6 +31,6 @@
     "precss": "3.1.2",
     "typedoc": "0.24.1",
     "typescript": "4.9.5",
-    "postcss": "^6.0.0"
+    "postcss": "^8.5.6"
   }
 }