chore(deps): bump toml from 0.7.8 to 0.8.20 in /backend

Bumps [toml](https://github.com/toml-rs/toml) from 0.7.8 to 0.8.20.
- [Commits](https://github.com/toml-rs/toml/compare/toml-v0.7.8...toml-v0.8.20)

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

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

backend/Cargo.lock

@@ -13967,7 +13967,7 @@ dependencies = [
  "regex",
  "serde_json",
  "syn 2.0.99",
- "toml 0.7.8",
+ "toml 0.8.20",
  "windmill-parser",
 ]
 

backend/Cargo.toml

@@ -347,7 +347,7 @@ backon = "1.3.0"
 # Macro-related
 proc-macro2 = "1.0"
 pulldown-cmark = "0.9"
-toml = "0.7"
+toml = "0.8"
 syn = { version = "2.0.74", features = ["full"] }
 quote = "1.0.36"
 regex-lite = "0.1.6"