fix: use dynamic repository paths in workflow tests

Replace local action paths with dynamic GitHub context variables
to test actions as external consumers would use them.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: vaind

.github/workflows/danger-workflow-tests.yml

@@ -17,7 +17,7 @@ jobs:
     steps:
       - name: Run danger action
         id: danger
-        uses: ./danger
+        uses: ${{ github.repository }}/danger@${{ github.sha }}
 
       - name: Validate danger outputs
         env:

.github/workflows/workflow-tests.yml

@@ -16,7 +16,7 @@ jobs:
     steps:
       - name: Run updater action
         id: updater
-        uses: ./updater
+        uses: ${{ github.repository }}/updater@${{ github.sha }}
         with:
           path: updater/tests/sentry-cli.properties
           name: WORKFLOW-TEST-DEPENDENCY-DO-NOT-MERGE
@@ -77,7 +77,7 @@ jobs:
     steps:
       - name: Run updater action
         id: updater
-        uses: ./updater
+        uses: ${{ github.repository }}/updater@${{ github.sha }}
         with:
           path: updater/tests/workflow-args.sh
           name: Workflow args test script