Remove ci-breaking re-fetching of tags

Author: dalito

.github/workflows/test-upstream.yaml

@@ -41,13 +41,6 @@ jobs:
           path: linkml-runtime
           fetch-depth: 0
 
-      - name: Ensure tags if not run from main repo
-        if: github.repository != 'linkml/linkml-runtime'
-        working-directory: linkml-runtime
-        run: |
-          git remote add upstream https://github.com/linkml/linkml-runtime
-          git fetch upstream --tags
-
       - name: set up python
         uses: actions/setup-python@0b93645e9fea7318ecaed2b359559ac225c90a2b
         with:
@@ -80,7 +73,6 @@ jobs:
       - name: add linkml-runtime to lockfile
         working-directory: linkml
         run: |
-          git -C linkml-runtime\ tag --list "v1.8.*"
           poetry add ../linkml-runtime
 
       # note that we run the installation step always, even if we restore a venv,