Update cargo_toml to 0.22.1 and toml to 0.9 (#3914)

The code in `src/splicing.rs` uses `toml::Value` types that were
incompatible—the workspace used `toml` 0.8.x but cargo_toml 0.22.3
depends on `toml` 0.9.x, creating a type mismatch. Therefore,
`Cargo.toml` was updated to use to use `toml = "0.9"` instead of
`"0.8.21"`.

Close #3721.

---------

Co-authored-by: UebelAndre <github@uebelandre.com>

Author: mrkkrp

MODULE.bazel

@@ -112,7 +112,7 @@ use_repo(
     "cui__cargo-lock-10.1.0",
     "cui__cargo-platform-0.1.9",
     "cui__cargo_metadata-0.19.2",
-    "cui__cargo_toml-0.22.1",
+    "cui__cargo_toml-0.22.3",
     "cui__cfg-expr-0.18.0",
     "cui__clap-4.5.37",
     "cui__crates-index-3.7.0",
@@ -134,7 +134,7 @@ use_repo(
     "cui__tempfile-3.19.1",
     "cui__tera-1.20.0",
     "cui__textwrap-0.16.2",
-    "cui__toml-0.8.21",
+    "cui__toml-0.9.5",
     "cui__tracing-0.1.41",
     "cui__tracing-subscriber-0.3.19",
     "cui__url-2.5.4",