Remove opower violation from hassfest requirements check (home-assistant#154797)

Author: cdce8p

script/hassfest/requirements.py

@@ -237,11 +237,6 @@
         # pyopnsense > pbr > setuptools
         "pbr": {"setuptools"}
     },
-    "opower": {
-        # https://github.com/arrow-py/arrow/issues/1169 (fixed not yet released)
-        # opower > arrow > types-python-dateutil
-        "arrow": {"types-python-dateutil"}
-    },
     "pvpc_hourly_pricing": {"aiopvpc": {"async-timeout"}},
     "remote_rpi_gpio": {
         # https://github.com/waveform80/colorzero/issues/9