chore(deps): bump spdx-tools from 0.7.1 to 0.8.1

Bumps [spdx-tools](https://github.com/spdx/tools-python) from 0.7.1 to 0.8.1.
- [Release notes](https://github.com/spdx/tools-python/releases)
- [Changelog](https://github.com/spdx/tools-python/blob/main/CHANGELOG.md)
- [Commits](spdx/tools-python@v0.7.1...v0.8.1)

---
updated-dependencies:
- dependency-name: spdx-tools
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

requirements.txt

@@ -1,2 +1,2 @@
-spdx-tools==0.7.1
+spdx-tools==0.8.1
 click==8.1.5