0.19.0-m1

Bump the tools group in /tools with 2 updates

Bumps the tools group in /tools with 2 updates: [github.com/docker/buildx](https://github.com/docker/buildx) and [helm.sh/helm/v3](https://github.com/helm/helm).


Updates `github.com/docker/buildx` from 0.15.1 to 0.16.0
- [Release notes](https://github.com/docker/buildx/releases)
- [Commits](https://github.com/docker/buildx/compare/v0.15.1...v0.16.0)

Updates `helm.sh/helm/v3` from 3.15.2 to 3.15.3
- [Release notes](https://github.com/helm/helm/releases)
- [Commits](https://github.com/helm/helm/compare/v3.15.2...v3.15.3)

---
updated-dependencies:
- dependency-name: github.com/docker/buildx
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: tools
- dependency-name: helm.sh/helm/v3
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: tools
...

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