fix call to nox in gha_matrix session (#137)

Author: joshuadavidthomas

CHANGELOG.md

@@ -17,6 +17,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ## [Unreleased]
 
+### Fixed
+
+- Dropped the `python -m` prefix in `gha_matrix` nox session.
+
 ## [2024.29]
 
 ### Removed

src/django_twc_package/noxfile.py.jinja

@@ -135,7 +135,7 @@ def types(session):
 
 @nox.session
 def gha_matrix(session):
-    sessions = session.run("python", "-m", "nox", "-l", "--json", silent=True)
+    sessions = session.run("nox", "-l", "--json", silent=True)
     matrix = {
         "include": [
             {