Bump toml_edit in build-template-pages tool (bevyengine#11342)

# Objective

- The
[`build-templated-pages`](https://github.com/bevyengine/bevy/tree/4778fbeb65d840eb39bda017fd428ebfc17a1153/tools/build-templated-pages)
tool is used to render the Markdown templates in the
[docs-template](https://github.com/bevyengine/bevy/tree/4778fbeb65d840eb39bda017fd428ebfc17a1153/docs-template)
folder.
- It depends on out outdated version of `toml_edit`.

## Solution

- Bump `toml_edit` to 0.21, disabling all features except `parse`.

crates/bevy_macro_utils/Cargo.toml

@@ -9,7 +9,7 @@ license = "MIT OR Apache-2.0"
 keywords = ["bevy"]
 
 [dependencies]
-toml_edit = "0.20"
+toml_edit = { version = "0.21", default-features = false, features = ["parse"] }
 syn = "2.0"
 quote = "1.0"
 rustc-hash = "1.0"

tools/build-templated-pages/Cargo.toml

@@ -7,7 +7,7 @@ publish = false
 license = "MIT OR Apache-2.0"
 
 [dependencies]
-toml_edit = "0.20"
+toml_edit = { version = "0.21", default-features = false, features = ["parse"] }
 tera = "1.15"
 serde = { version = "1.0", features = ["derive"] }
 bitflags = "2.3"

tools/example-showcase/Cargo.toml

@@ -10,5 +10,5 @@ license = "MIT OR Apache-2.0"
 xshell = "0.2"
 clap = { version = "4.0", features = ["derive"] }
 ron = "0.8"
-toml_edit = "0.20"
+toml_edit = { version = "0.21", default-features = false, features = ["parse"] }
 pbr = "1.1"