fix(deps): update rust crate scraper to 0.21 (#266)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Cargo.toml

@@ -12,7 +12,7 @@ documentation = "https://langchain-rust.sellie.tech/get-started/quickstart"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-scraper = "0.20"
+scraper = "0.21"
 serde = { version = "1.0", features = ["derive"] }
 async-trait = "0.1.80"
 tokio = { version = "1", features = ["full"] }