fix(auth): fixup aiohttp v3.3.0 compat

Avoid new API usage, introduce ability to avoid stomping over configured
session-level `auto_decompress` setting.

auth/gcloud/aio/auth/session.py

@@ -55,7 +55,7 @@ async def get(
         self, url: str, headers: Optional[Mapping[str, str]],
         timeout: float, params: Optional[Mapping[str, Union[int, str]]],
         stream: bool,
-        auto_decompress: bool,
+        auto_decompress: Optional[bool],
     ) -> Response:
         pass
 
@@ -200,7 +200,7 @@ async def get(  # type: ignore[override]
             timeout: Timeout = 10,
             params: Optional[Mapping[str, Union[int, str]]] = None,
             stream: Optional[bool] = None,
-            auto_decompress: bool = True,
+            auto_decompress: Optional[bool] = None,
         ) -> aiohttp.ClientResponse:
             if not isinstance(timeout, aiohttp.ClientTimeout):
                 timeout = aiohttp.ClientTimeout(total=timeout)
@@ -211,11 +211,21 @@ async def get(  # type: ignore[override]
                     'this argument is only used by SyncSession',
                     stream,
                 )
+
+            # TODO: in aiohttp v3.9.0, session.get(..) learned the
+            # auto_decompress argument. Once our minimum bound is >=3.9.0,
+            # update this block to avoid patching the prviate session
+            # attribute.
+            # pylint: disable=protected-access
+            orig = self.session._auto_decompress
+            if auto_decompress is not None:
+                self.session._auto_decompress = auto_decompress
             resp = await self.session.get(
                 url, headers=headers,
                 timeout=timeout, params=params,
-                auto_decompress=auto_decompress,
             )
+            self.session._auto_decompress = orig
+
             await _raise_for_status(resp)
             return resp
 
@@ -339,9 +349,9 @@ async def get(
             timeout: float = 10,
             params: Optional[Mapping[str, Union[int, str]]] = None,
             stream: bool = False,
-            auto_decompress: bool = True,
+            auto_decompress: Optional[bool] = None,
         ) -> Response:
-            if not auto_decompress and not stream:
+            if auto_decompress is False and not stream:
                 warnings.warn(
                     'the requests library always decompresses responses when '
                     'outside of streaming mode; when auto_decompress is '

auth/pyproject.rest.toml

@@ -21,7 +21,7 @@ classifiers = [
 
 [tool.poetry.dependencies]
 python = ">= 3.8, < 4.0"
-# aiohttp = ">= 3.9.0, < 4.0.0"
+# aiohttp = ">= 3.3.0, < 4.0.0"
 backoff = ">= 1.0.0, < 3.0.0"
 chardet = ">= 2.0, < 6.0"
 # See https://cryptography.io/en/latest/api-stability/#deprecation

auth/pyproject.toml

@@ -21,7 +21,7 @@ classifiers = [
 
 [tool.poetry.dependencies]
 python = ">= 3.8, < 4.0"
-aiohttp = ">= 3.9.0, < 4.0.0"
+aiohttp = ">= 3.3.0, < 4.0.0"
 backoff = ">= 1.0.0, < 3.0.0"
 chardet = ">= 2.0, < 6.0"
 # See https://cryptography.io/en/latest/api-stability/#deprecation