Pin CI to vgi-rpc>=0.1.12 from PyPI instead of git install

Now that _pytest_suite and --describe are published in 0.1.12,
install from PyPI with a minimum version pin.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: rustyconover

.github/workflows/ci.yml

@@ -120,7 +120,7 @@ jobs:
         run: bun install && bun run postinstall
 
       - name: Install Python dependencies
-        run: pip install "vgi-rpc[http,cli] @ git+https://github.com/Query-farm/vgi-rpc-python.git" pytest
+        run: pip install "vgi-rpc[http,cli]>=0.1.12" pytest
 
       - name: Run conformance tests
         run: timeout 120 python -m pytest test_ts_conformance.py -x -v