tests: Drop hypothesis < 6 requirement

Ensure tests can be executed using hypothesis >= 6 by suppressing
the function_scoped_fixture health check on test that uses a function
scope fixture in combination with @given that does not need to be reset
between individual hypothesis examples.

requirements-test.txt

 pytest
 pytest-mock
 requests-mock
-hypothesis >= 3.11.0, < 6
+hypothesis >= 3.11.0
 pre-commit
 pytz

swh/core/db/tests/conftest.py

 import os
 
+from hypothesis import HealthCheck
+
 os.environ["LC_ALL"] = "C.UTF-8"
+
+# we use getattr here to keep mypy happy regardless hypothesis version
+function_scoped_fixture_check = (
+    [getattr(HealthCheck, "function_scoped_fixture")]
+    if hasattr(HealthCheck, "function_scoped_fixture")
+    else []
+)

swh/core/db/tests/test_db.py

@@ -12,7 +12,7 @@ from typing import Any
 from unittest.mock import MagicMock, Mock
 import uuid
 
-from hypothesis import given, strategies
+from hypothesis import given, settings, strategies
 from hypothesis.extra.pytz import timezones
 import psycopg2
 import pytest
@@ -21,6 +21,7 @@ from typing_extensions import Protocol
 from swh.core.db import BaseDb
 from swh.core.db.common import db_transaction, db_transaction_generator
 from swh.core.db.pytest_plugin import postgresql_fact
+from swh.core.db.tests.conftest import function_scoped_fixture_check
 
 
 # workaround mypy bug https://github.com/python/mypy/issues/5485
@@ -282,6 +283,7 @@ def test_db_copy_to_static(db_with_data):
         assert EXPECTED_ROW_OUT == output[0]
 
 
+@settings(suppress_health_check=function_scoped_fixture_check)
 @given(db_rows)
 def test_db_copy_to(db_with_data, data):
     items = [dict(zip(COLUMNS, item)) for item in data]