build(deps): bump lwc from 6.5.0 to 8.1.2

Bumps [lwc](https://github.com/salesforce/lwc/tree/HEAD/packages/lwc) from 6.5.0 to 8.1.2.
- [Release notes](https://github.com/salesforce/lwc/releases)
- [Commits](https://github.com/salesforce/lwc/commits/v8.1.2/packages/lwc)

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

Signed-off-by: dependabot[bot] <[email protected]>