Drop spurious multhreading test

clin1234 · clin1234 · commit ccfd2547c7d8 · 2025-09-11T17:44:53.000Z
Per #641 (comment), sharing more than one `Packer` object is not supported.
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
@@ -29,8 +29,6 @@ jobs:
       - name: Prepare
         shell: bash
         run: |
-          # TODO: Workaround for Windows tests failing when upgrading `pip` with exit code 1
-          # pip install -U pip
           pip install -r requirements.txt pytest
 
       - name: Install pytest-run-parallel under free-threading
diff --git a/msgpack/_cmsgpack.pyx b/msgpack/_cmsgpack.pyx
@@ -1,5 +1,5 @@
 # coding: utf-8
-#cython: embedsignature=True, c_string_encoding=ascii, language_level=3, freethreading_compatible=True
+# cython: embedsignature=True, c_string_encoding=ascii, language_level=3, freethreading_compatible=True
 from cpython.datetime cimport import_datetime, datetime_new
 import_datetime()
 
diff --git a/test/uneeded_test_multithreading.py b/test/uneeded_test_multithreading.py
