Bump the libcnb group with 3 updates (#116)

Bumps the libcnb group with 3 updates: [libcnb](https://github.com/heroku/libcnb.rs), [libherokubuildpack](https://github.com/heroku/libcnb.rs) and [libcnb-test](https://github.com/heroku/libcnb.rs).


Updates `libcnb` from 0.12.0 to 0.13.0
- [Release notes](https://github.com/heroku/libcnb.rs/releases)
- [Changelog](https://github.com/heroku/libcnb.rs/blob/main/CHANGELOG.md)
- [Commits](heroku/libcnb.rs@v0.12.0...v0.13.0)

Updates `libherokubuildpack` from 0.12.0 to 0.13.0
- [Release notes](https://github.com/heroku/libcnb.rs/releases)
- [Changelog](https://github.com/heroku/libcnb.rs/blob/main/CHANGELOG.md)
- [Commits](heroku/libcnb.rs@v0.12.0...v0.13.0)

Updates `libcnb-test` from 0.12.0 to 0.13.0
- [Release notes](https://github.com/heroku/libcnb.rs/releases)
- [Changelog](https://github.com/heroku/libcnb.rs/blob/main/CHANGELOG.md)
- [Commits](heroku/libcnb.rs@v0.12.0...v0.13.0)

---
updated-dependencies:
- dependency-name: libcnb
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: libcnb
- dependency-name: libherokubuildpack
  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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Cargo.toml

@@ -8,8 +8,8 @@ rust-version = "1.66"
 
 [dependencies]
 flate2 = { version = "1", default-features = false, features = ["zlib"] }
-libcnb = "0.12"
-libherokubuildpack = { version = "0.12", default-features = false, features = ["log"] }
+libcnb = "0.13"
+libherokubuildpack = { version = "0.13", default-features = false, features = ["log"] }
 regex = "1"
 semver = "1"
 serde = "1"
@@ -22,4 +22,4 @@ toml = "0.7"
 ureq = { version = "2", features = ["json"] }
 
 [dev-dependencies]
-libcnb-test = "0.12"
+libcnb-test = "0.13"