[Core] Update for next-mypy

This updates azure-core and corehttp to pass the next-mypy checks.

Signed-off-by: Paul Van Eck <[email protected]>

Author: pvaneck

sdk/core/azure-core/azure/core/pipeline/transport/_requests_asyncio.py

@@ -155,6 +155,7 @@ async def send(  # pylint:disable=invalid-overridden-method
         :keyword MutableMapping proxies: will define the proxy to use. Proxy is a dict (protocol, url)
         """
         self.open()
+        assert self.session is not None
         loop = kwargs.get("loop", _get_running_loop())
         response = None
         error: Optional[AzureErrorUnion] = None

sdk/core/azure-core/azure/core/pipeline/transport/_requests_trio.py

@@ -228,6 +228,7 @@ async def send(
         :keyword MutableMapping proxies: will define the proxy to use. Proxy is a dict (protocol, url)
         """
         self.open()
+        assert self.session is not None
         trio_limiter = kwargs.get("trio_limiter", None)
         response = None
         error: Optional[AzureErrorUnion] = None

sdk/core/azure-core/azure/core/rest/_http_response_impl.py

@@ -294,10 +294,10 @@ def encoding(self) -> Optional[str]:
             return self._encoding
 
     @encoding.setter
-    def encoding(self, value: str) -> None:
+    def encoding(self, value: Optional[str]) -> None:
         """Sets the response encoding.
 
-        :param str value: Sets the response encoding.
+        :param optional[str] value: Sets the response encoding.
         """
         self._encoding = value
         self._text = None  # clear text cache

sdk/core/corehttp/corehttp/rest/_http_response_impl.py

@@ -166,10 +166,10 @@ def encoding(self) -> Optional[str]:
             return self._encoding
 
     @encoding.setter
-    def encoding(self, value: str) -> None:
+    def encoding(self, value: Optional[str]) -> None:
         """Sets the response encoding.
 
-        :param str value: Sets the response encoding.
+        :param optional[str] value: Sets the response encoding.
         """
         self._encoding = value
         self._text = None  # clear text cache