Remove unneeded warning filters (#2811)

Author: Kludex

pyproject.toml

@@ -85,10 +85,7 @@ filterwarnings = [
     "ignore: run_until_first_complete is deprecated and will be removed in a future version.:DeprecationWarning",
     "ignore: starlette.middleware.wsgi is deprecated and will be removed in a future release.*:DeprecationWarning",
     "ignore: Async generator 'starlette.requests.Request.stream' was garbage collected before it had been exhausted.*:ResourceWarning",
-    "ignore: path is deprecated.*:DeprecationWarning:certifi",
     "ignore: Use 'content=<...>' to upload raw bytes/text content.:DeprecationWarning",
-    "ignore: 'cgi' is deprecated and slated for removal in Python 3.13:DeprecationWarning",
-    "ignore: You seem to already have a custom sys.excepthook handler installed. I'll skip installing Trio's custom handler, but this means MultiErrors will not show full tracebacks.:RuntimeWarning",
     # TODO: This warning appeared when we bumped anyio to 4.4.0.
     "ignore: Unclosed .MemoryObject(Send|Receive)Stream.:ResourceWarning",
 ]