fix(deps): bump lwc from 8.21.2 to 8.21.6 (#502)

Bumps [lwc](https://github.com/salesforce/lwc/tree/HEAD/packages/lwc) from 8.21.2 to 8.21.6.
- [Release notes](https://github.com/salesforce/lwc/releases)
- [Commits](https://github.com/salesforce/lwc/commits/v8.21.6/packages/lwc)

---
updated-dependencies:
- dependency-name: lwc
  dependency-version: 8.21.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

package.json

@@ -17,7 +17,7 @@
     "@salesforce/sf-plugins-core": "^11.2.4",
     "axios": "^1.11.0",
     "glob": "^10.4.5",
-    "lwc": "~8.21.2",
+    "lwc": "~8.21.6",
     "node-fetch": "^3.3.2",
     "open": "^10.2.0",
     "xml2js": "^0.6.2"