chore(deps): bump toml in /backend

Bumps [toml](https://github.com/toml-rs/toml) from 0.9.10+spec-1.1.0 to 1.0.3+spec-1.1.0.
- [Commits](toml-rs/toml@toml-v0.9.10...toml-v1.0.3)

---
updated-dependencies:
- dependency-name: toml
  dependency-version: 1.0.3+spec-1.1.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

backend/Cargo.lock

@@ -17,7 +17,7 @@
     "raw_value",
   ] }
   tokio = { version = "1.48.0", features = [ "macros", "rt-multi-thread" ] }
-  toml = { version = "0.9.10" }
+  toml = { version = "1.0.3" }
   tower-http = { version = "0.6", features = [ "cors" ] }
   tracing = { version = "0.1" }
   tracing-subscriber = { version = "0.3.22", features = [ "env-filter" ] }