[TST]: run test_cross_version_persist tests sequentially (#4264)

## Description of changes

This test frequently flakes when parallelized.

Author: codetheweb

.github/workflows/_python-tests.yml

@@ -23,9 +23,11 @@ jobs:
         platform: [depot-ubuntu-24.04-8, depot-windows-2022-8]
         test-globs:
           - "--ignore-glob 'chromadb/test/property/*' --ignore-glob 'chromadb/test/stress/*' --ignore-glob 'chromadb/test/distributed/*'"
-          - "chromadb/test/property"
+          - "chromadb/test/property --ignore-glob chromadb/test/property/test_cross_version_persist.py"
+          # TODO(@codetheweb): this test should be parallelized, but it frequently flakes in CI when parallelized. We have not been able to reproduce the failure locally. See https://github.com/chroma-core/chroma/issues/4263.
+          - "chromadb/test/property/test_cross_version_persist.py"
         include:
-          - test-globs: "chromadb/test/property"
+          - test-globs: "chromadb/test/property --ignore-glob chromadb/test/property/test_cross_version_persist.py"
             parallelized: true
 
     runs-on: ${{ matrix.platform }}