build(deps): bump scraper from 0.20.0 to 0.21.0

Bumps [scraper](https://github.com/causal-agent/scraper) from 0.20.0 to 0.21.0.
- [Release notes](https://github.com/causal-agent/scraper/releases)
- [Commits](rust-scraper/scraper@v0.20.0...v0.21.0)

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

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

Cargo.toml

@@ -32,7 +32,7 @@ bincode = {version="1.3.3", default-features=false}
 maud = { version = "0.26.0", default-features = false, features = [
     "actix-web",
 ] }
-scraper = { version = "0.20.0", default-features = false }
+scraper = { version = "0.21.0", default-features = false }
 actix-web = { version = "4.9.0", features = [
     "cookies",
     "macros",