Bump frankenstein from 0.30.8 to 0.31.0 (#770)

Bumps [frankenstein](https://github.com/ayrat555/frankenstein) from 0.30.8 to 0.31.0.
- [Release notes](https://github.com/ayrat555/frankenstein/releases)
- [Changelog](https://github.com/ayrat555/frankenstein/blob/master/CHANGELOG.md)
- [Commits](ayrat555/frankenstein@0.30.8...0.31.0)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Cargo.lock

@@ -40,7 +40,7 @@ env_logger = "0.11.3"
 chrono = {version  = "0.4.38", default-features=false, features = ["serde"]}
 actix-web-actors = "4.3.0"
 rss = "2.0.8"
-frankenstein = "0.30.8"
+frankenstein = "0.31.0"
 regex = "1.10.4"
 xml-builder = "0.5.2"
 diesel = { version = "2.1.6", features = ["chrono", "r2d2"] }