Configure DB API interface attribute threadsafety = 1

This signals "Threads may share the module, but not connections.",
according to PEP 0249.

-- https://peps.python.org/pep-0249/#threadsafety

CHANGES.txt

@@ -8,6 +8,8 @@ Unreleased
 - The SQLAlchemy dialect has been split off into the `sqlalchemy-cratedb`_
   package. See `Migrate from crate.client to sqlalchemy-cratedb`_ to learn
   about necessary migration steps.
+- Configured DB API interface attribute ``threadsafety = 1``, which signals
+  "Threads may share the module, but not connections."
 
 .. _Migrate from crate.client to sqlalchemy-cratedb: https://cratedb.com/docs/sqlalchemy-cratedb/migrate-from-crate-client.html
 .. _sqlalchemy-cratedb: https://pypi.org/project/sqlalchemy-cratedb/

src/crate/client/__init__.py

@@ -32,5 +32,5 @@
 __version__ = "0.35.2"
 
 apilevel = "2.0"
-threadsafety = 2
+threadsafety = 1
 paramstyle = "qmark"