chore(deps): update dependency python-semantic-release to v9.21.0 (#144)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

requirements.txt

@@ -1,7 +1,7 @@
 pycodestyle==2.12.1
 coveralls==4.0.1
 pygame==2.6.1
-python-semantic-release==9.20.0
+python-semantic-release==9.21.0
 mypy==1.14.1
 wheel==0.45.1
 micropython-rp2-pico-stubs==1.20.0.post5