build(deps): bump serde_yaml from 0.9.27 to 0.9.29 in /tmpl8

Bumps [serde_yaml](https://github.com/dtolnay/serde-yaml) from 0.9.27 to 0.9.29.
- [Release notes](https://github.com/dtolnay/serde-yaml/releases)
- [Commits](dtolnay/serde-yaml@0.9.27...0.9.29)

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

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