build(deps): update reqwest requirement from 0.11 to 0.12

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](seanmonstar/reqwest@v0.11.0...v0.12.0)

---
updated-dependencies:
- dependency-name: reqwest
  dependency-type: direct:production
...

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

testing/Cargo.toml

@@ -13,7 +13,7 @@ categories = ["web-programming", "development-tools::testing"]
 
 [dependencies]
 kvarn = { path = "../", features = ["full"], version = "0.6.0" }
-reqwest = { version = "0.11", default-features = false, features = ["rustls-tls-manual-roots"] }
+reqwest = { version = "0.12", default-features = false, features = ["rustls-tls-manual-roots"] }
 rand = "0.8"
 rcgen = "0.12"
 tokio = { version = "1.24", features = ["macros"] }