Update spdx requirement from 0.12 to 0.13 (#1323)

Updates the requirements on [spdx](https://github.com/EmbarkStudios/spdx) to permit the latest version.
- [Release notes](https://github.com/EmbarkStudios/spdx/releases)
- [Changelog](https://github.com/EmbarkStudios/spdx/blob/main/CHANGELOG.md)
- [Commits](https://github.com/EmbarkStudios/spdx/compare/0.12.0...0.13.0)

---
updated-dependencies:
- dependency-name: spdx
  dependency-version: 0.13.0
  dependency-type: direct:production
...

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

tools/codegen/Cargo.toml

@@ -14,7 +14,7 @@ serde = "1"
 serde_derive = "1"
 serde_json = "1"
 sha2 = "0.10"
-spdx = "0.12"
+spdx = "0.13"
 tar = "0.4"
 toml = { version = "0.9", default-features = false, features = ["parse", "serde"] }
 # TODO: call curl command instead of using ureq?