Bump css-what from 5.0.0 to 5.0.1 in /openwpm/Extension/firefox (#935)

Bumps [css-what](https://github.com/fb55/css-what) from 5.0.0 to 5.0.1.
- [Release notes](https://github.com/fb55/css-what/releases)
- [Commits](https://github.com/fb55/css-what/compare/v5.0.0...v5.0.1)

---
updated-dependencies:
- dependency-name: css-what
  dependency-type: indirect
...

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

openwpm/Extension/firefox/package-lock.json

@@ -1657,9 +1657,9 @@
       }
     },
     "css-what": {
-      "version": "5.0.0",
-      "resolved": "https://registry.npmjs.org/css-what/-/css-what-5.0.0.tgz",
-      "integrity": "sha512-qxyKHQvgKwzwDWC/rGbT821eJalfupxYW2qbSJSAtdSTimsr/MlaGONoNLllaUPZWf8QnbcKM/kPVYUQuEKAFA==",
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/css-what/-/css-what-5.0.1.tgz",
+      "integrity": "sha512-FYDTSHb/7KXsWICVsxdmiExPjCfRC4qRFBdVwv7Ax9hMnvMmEjP9RfxTEZ3qPZGmADDn2vAKSo9UcN1jKVYscg==",
       "dev": true
     },
     "dashdash": {