chore(deps): update reqwest requirement in /eppo_core

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@v0.12.4...v0.12.28)

---
updated-dependencies:
- dependency-name: reqwest
  dependency-version: 0.12.28
  dependency-type: direct:production
...

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

Author: dependabot[bot]

eppo_core/Cargo.toml

@@ -36,7 +36,7 @@ log = { version = "0.4.21", features = ["kv", "kv_serde"] }
 md-5 = { version = "0.10.6", default-features = false, features = ["std"] }
 rand = "0.9.0"
 regex = "1.10.4"
-reqwest = { version = "0.12.4", default-features = false, features = ["json", "rustls-tls"] }
+reqwest = { version = "0.13.1", default-features = false, features = ["json", "rustls-tls"] }
 semver = { version = "1.0.22", features = ["serde"] }
 serde = { version = "1.0.198", features = ["derive", "rc"] }
 serde-bool = "0.1.3"