build(deps-dev): Bump knip from 5.88.1 to 6.6.0

Bumps [knip](https://github.com/webpro-nl/knip/tree/HEAD/packages/knip) from 5.88.1 to 6.6.0.
- [Release notes](https://github.com/webpro-nl/knip/releases)
- [Commits](https://github.com/webpro-nl/knip/commits/knip@6.6.0/packages/knip)

---
updated-dependencies:
- dependency-name: knip
  dependency-version: 6.6.0
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -19,7 +19,7 @@ jobs:
     - name: Use minimal supported Node.js version
       uses: actions/setup-node@v6
       with:
-        node-version: 20.17.0
+        node-version: 20.19.0
 
     - name: Install dependencies
       run: npm ci

knip.config.js

@@ -6,7 +6,6 @@ const config = {
 	rules: {
 		files: "off",
 		duplicates: "off",
-		classMembers: "off",
 		unlisted: "off",
 		binaries: "off",
 		unresolved: "off",