Update reqwest requirement from 0.8 to 0.9

Updates the requirements on [reqwest](https://github.com/seanmonstar/reqwest) to permit the latest version.
- [Release notes](https://github.com/seanmonstar/reqwest/releases)
- [Changelog](https://github.com/seanmonstar/reqwest/blob/master/CHANGELOG.md)
- [Commits](https://github.com/seanmonstar/reqwest/commits/v0.9.0)

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

Cargo.toml

@@ -13,7 +13,7 @@ categories = ["web-programming", "web-programming::http-client", "api-bindings"]
 [dependencies]
 doc-comment = "0.1"
 isolang = { version = "0.2", features = ["serde_serialize"] }
-reqwest = "0.8"
+reqwest = "0.9"
 serde = "1"
 serde_derive = "1"
 serde_json = "1"