Bump build/metaschema-xslt from bd4359a to 7d9fbfa

Bumps [build/metaschema-xslt](https://github.com/usnistgov/metaschema-xslt) from `bd4359a` to `7d9fbfa`.
- [Commits](usnistgov/metaschema-xslt@bd4359a...7d9fbfa)

---
updated-dependencies:
- dependency-name: build/metaschema-xslt
  dependency-type: direct:production
...

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