Bump sqltoolsservice from 54fe38e to 78c35f7

Bumps [sqltoolsservice](https://github.com/microsoft/sqltoolsservice) from `54fe38e` to `78c35f7`.
- [Release notes](https://github.com/microsoft/sqltoolsservice/releases)
- [Commits](microsoft/sqltoolsservice@54fe38e...78c35f7)

---
updated-dependencies:
- dependency-name: sqltoolsservice
  dependency-type: direct:production
...

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