De-flake test_refresh_extends_lease on slower CI runners

Bump ttl from 0.15s to 2.0s and contender timeout from 0.05s to 0.1s so
scheduling jitter between the last refresh and the contender.acquire on
Windows CI can't let the lease lapse. Sleep duration stays at 3 x 0.05s so
the test still exercises three refresh rounds.

Author: JE-Chen

tests/test_sqlite_lock.py

@@ -77,13 +77,13 @@ def test_release_does_not_affect_other_owner(tmp_path: Path) -> None:
 
 def test_refresh_extends_lease(tmp_path: Path) -> None:
     db = tmp_path / "refresh.sqlite"
-    holder = SQLiteLock(db, "keep", ttl=0.15)
+    holder = SQLiteLock(db, "keep", ttl=2.0)
     holder.acquire()
     try:
         for _ in range(3):
             time.sleep(0.05)
             holder.refresh()
-        contender = SQLiteLock(db, "keep", timeout=0.05)
+        contender = SQLiteLock(db, "keep", timeout=0.1)
         with pytest.raises(LockTimeoutException):
             contender.acquire()
     finally: