fix: Fix type hints in stdio client and logging server snippet

Author: sesajad

examples/snippets/servers/logging.py

@@ -5,12 +5,13 @@
 import sys
 
 from mcp.server.fastmcp import Context, FastMCP
+from mcp.server.session import ServerSession
 
 mcp = FastMCP("Logging and stdio test")
 
 
 @mcp.tool()
-async def log(ctx: Context) -> str:
+async def log(ctx: Context[ServerSession, None]) -> str:
     await ctx.debug("Debug message")
     await ctx.info("Info message")
     print("Stderr message", file=sys.stderr)

src/mcp/client/stdio/__init__.py

@@ -236,7 +236,7 @@ async def _create_platform_compatible_process(
     command: str,
     args: list[str],
     env: dict[str, str] | None = None,
-    errlog: TextIO = sys.stderr,
+    errlog: TextIO | None = None,
     cwd: Path | str | None = None,
 ):
     """