Bump askama from 0.15.6 to 0.16.0 in /autorust (#787)

Bumps [askama](https://github.com/askama-rs/askama) from 0.15.6 to 0.16.0.
- [Release notes](https://github.com/askama-rs/askama/releases)
- [Commits](askama-rs/askama@v0.15.6...v0.16.0)

---
updated-dependencies:
- dependency-name: askama
  dependency-version: 0.16.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

autorust/Cargo.lock

@@ -23,7 +23,7 @@ http-types = "2"
 once_cell = "1"
 syn = { version = "2", features = ["parsing"] }
 camino = "1"
-askama = "0.15"
+askama = "0.16"
 toml = "1.1"
 qstring = "0.7"
 cargo_toml = "0.22"