chore: update TUF spec version (#392)

We fixed #321 but forgot to update this, so now the GH actions bot is
confused (#391).

Signed-off-by: Zachary Newman <[email protected]>

Author: znewman01

.github/workflows/specification-version-check.yml

@@ -11,4 +11,4 @@ jobs:
       issues: write
     uses: theupdateframework/specification/.github/workflows/check-latest-spec-version.yml@master
     with:
-      tuf-version: "v1.0.29" # Should be updated to the according version either manually or extracted automatically as how it's done in python-tuf
+      tuf-version: "v1.0.30" # Should be updated to the according version either manually or extracted automatically as how it's done in python-tuf