build(deps-dev): bump sigstore-protobuf-specs from 0.1.0 to 0.2.0

Bumps [sigstore-protobuf-specs](https://github.com/sigstore/protobuf-specs) from 0.1.0 to 0.2.0.
- [Release notes](https://github.com/sigstore/protobuf-specs/releases)
- [Changelog](https://github.com/sigstore/protobuf-specs/blob/main/RELEASE.md)
- [Commits](sigstore/protobuf-specs@v0.1.0...v0.2.0)

---
updated-dependencies:
- dependency-name: sigstore-protobuf-specs
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

pyproject.toml

@@ -35,7 +35,7 @@ dependencies = [
   "pyOpenSSL >= 23.0.0",
   "requests",
   "securesystemslib",
-  "sigstore-protobuf-specs ~= 0.1.0",
+  "sigstore-protobuf-specs >= 0.1,< 0.3",
   "tuf >= 2.1,< 4.0",
 ]
 requires-python = ">=3.7"