Fix: issue with mypy in multi-process scenarios

[nickolay168]

Multiple instances of mypy are trying to access the same cache database, resulting in failure:

  File "/opt/hostedtoolcache/Python/3.13.15/x64/lib/python3.13/site-packages/mypy/__main__.py", line 16, in console_entry
    main()
    ~~~~^^
  File "mypy/main.py", line 154, in main
  File "mypy/main.py", line 244, in run_build
    res = build.build(sources, options, None, flush_errors, fscache, stdout, stderr)
  File "mypy/build.py", line 385, in build
  File "mypy/build.py", line 1908, in create_metastore
    mds: MetadataStore = SqliteMetadataStore(
  File "mypy/metastore.py", line 200, in __init__
  File "mypy/metastore.py", line 174, in connect_db
    db.execute("PRAGMA journal_mode=WAL")

Fix: Skip using cache dir.

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