build: add pins for Pgvector (#1849)

Author: anakin87

.github/workflows/pgvector.yml

@@ -64,9 +64,16 @@ jobs:
       - name: Run tests
         run: hatch run cov-retry
 
+      - name: Run unit tests with lowest direct dependencies
+        run: |
+          hatch run uv pip compile pyproject.toml --resolution lowest-direct --output-file requirements_lowest_direct.txt
+          hatch run uv pip install -r requirements_lowest_direct.txt
+          hatch run test -m "not integration"
+
       - name: Nightly - run unit tests with Haystack main branch
         if: github.event_name == 'schedule'
         run: |
+          hatch env prune
           hatch run uv pip install git+https://github.com/deepset-ai/haystack.git@main
           hatch run cov-retry -m "not integration"
 

integrations/pgvector/pyproject.toml

@@ -23,7 +23,7 @@ classifiers = [
   "Programming Language :: Python :: Implementation :: CPython",
   "Programming Language :: Python :: Implementation :: PyPy",
 ]
-dependencies = ["haystack-ai>=2.11.0", "pgvector", "psycopg[binary]"]
+dependencies = ["haystack-ai>=2.11.0", "pgvector>=0.3.0", "psycopg[binary]"]
 
 [project.urls]
 Source = "https://github.com/deepset-ai/haystack-core-integrations"