Bump the libcnb group with 2 updates

Bumps the libcnb group with 2 updates: [libcnb](https://github.com/heroku/libcnb.rs) and [libcnb-test](https://github.com/heroku/libcnb.rs).


Updates `libcnb` from 0.25.0 to 0.26.0
- [Release notes](https://github.com/heroku/libcnb.rs/releases)
- [Changelog](https://github.com/heroku/libcnb.rs/blob/main/CHANGELOG.md)
- [Commits](heroku/libcnb.rs@v0.25.0...v0.26.0)

Updates `libcnb-test` from 0.25.0 to 0.26.0
- [Release notes](https://github.com/heroku/libcnb.rs/releases)
- [Changelog](https://github.com/heroku/libcnb.rs/blob/main/CHANGELOG.md)
- [Commits](heroku/libcnb.rs@v0.25.0...v0.26.0)

---
updated-dependencies:
- dependency-name: libcnb
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: libcnb
- dependency-name: libcnb-test
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: libcnb
...

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

Cargo.toml

@@ -16,7 +16,7 @@ bullet_stream = "0.3"
 debversion = "0.4"
 futures = { version = "0.3", default-features = false, features = ["io-compat"] }
 indexmap = "2"
-libcnb = { version = "=0.25.0", features = ["trace"] }
+libcnb = { version = "=0.26.0", features = ["trace"] }
 indoc = "2"
 rayon = "1"
 reqwest = { version = "0.12", default-features = false, features = ["stream", "rustls-tls"] }
@@ -32,7 +32,7 @@ toml_edit = "0.22"
 walkdir = "2"
 
 [dev-dependencies]
-libcnb-test = "=0.25.0"
+libcnb-test = "=0.26.0"
 regex = "1"
 strip-ansi-escapes = "0.2"
 tempfile = "3"