Update rstest requirement from 0.25.0 to 0.26.1 (#14)

Updates the requirements on [rstest](https://github.com/la10736/rstest) to permit the latest version.
- [Release notes](https://github.com/la10736/rstest/releases)
- [Changelog](https://github.com/la10736/rstest/blob/master/CHANGELOG.md)
- [Commits](la10736/rstest@v0.25.0...v0.26.1)

---
updated-dependencies:
- dependency-name: rstest
  dependency-version: 0.26.1
  dependency-type: direct:production
...

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

Author: dependabot[bot]

Cargo.toml

@@ -34,7 +34,7 @@ rcgen = { version = "0.14.1", default-features = false, features = [
     "aws_lc_rs",
     "pem",
 ] }
-rstest = "0.25.0"
+rstest = "0.26.1"
 # Use aws_lc_rs to test our provider
 rustls = { version = "0.23.0", features = [
     "aws-lc-rs",