Merge pull request #2764 from jku/fix-spec-version-check

workflows: Fix the spec version check

Author: jku

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

@@ -20,6 +20,7 @@ jobs:
           python-version: "3.x"
       - id: get-version
         run: |
+          python3 -m pip install -r requirements/pinned.txt
           script="from tuf.api.metadata import SPECIFICATION_VERSION; \
                   print(f\"v{'.'.join(SPECIFICATION_VERSION)}\")"
           ver=$(python3 -c "$script")