Handle closed-time typos from SWP API and update local dev setup (#32)

* updated dependencies, fixed "geschlossen" parsing

* httpretty.core warning patch

---------

Co-authored-by: Hadrian Burkhardt <hadrian.burkhardt@gmx.de>

tests/conftest.py

@@ -0,0 +1,13 @@
+import datetime as _dt
+
+import httpretty.core as _httpretty_core
+
+
+class _PatchedDateTime(_dt.datetime):
+    @classmethod
+    def utcnow(cls):
+        return _dt.datetime.now(_dt.UTC)
+
+
+def pytest_configure():
+    _httpretty_core.datetime = _PatchedDateTime